Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1971 | - | - | -11.2(100) | -14.6( 99) | -16.9( 99) | -16.0( 99) | -20.6(100) | -20.0(100) | -20.8(100) | -16.2( 99) | -11.9(100) | -5.2(100) |
1972 | -2.6(100) | -6.3(100) | -11.1(100) | -13.5(100) | -19.1(100) | -18.3(100) | -18.8(100) | -21.3(100) | -19.9(100) | -19.5(100) | -12.4(100) | -5.1(100) |
1973 | -4.1(100) | -9.0(100) | -12.0( 99) | -15.5(100) | -17.7( 99) | -19.3(100) | -19.7( 99) | -21.3(100) | -21.3( 99) | -18.8(100) | -9.3( 99) | -5.6(100) |
1974 | -4.0(100) | -8.1(100) | -11.6(100) | -17.5(100) | -18.6( 99) | -16.0(100) | -24.2( 99) | -20.6(100) | -20.1( 99) | -18.2(100) | -10.2(100) | -4.5( 99) |
1975 | -3.9(100) | -7.0( 99) | -11.2( 99) | -16.8(100) | -19.2(100) | -21.6(100) | -18.9(100) | -24.4(100) | -22.7(100) | -19.7(100) | -11.2(100) | -5.5(100) |
1976 | -3.8(100) | -6.6(100) | -12.5(100) | -20.9(100) | -20.3(100) | -23.4(100) | -22.0(100) | -21.3(100) | -23.1(100) | -22.9(100) | -10.2( 99) | -3.1(100) |
1977 | -2.7(100) | -7.1(100) | -11.7( 99) | -15.5( 99) | -20.7( 99) | -20.6(100) | -23.2( 99) | -20.1(100) | -23.3( 99) | -17.2(100) | -10.8(100) | -5.2(100) |
1978 | -5.4(100) | -6.2(100) | -9.5(100) | -14.0(100) | -20.1( 99) | -22.3(100) | -17.8(100) | -25.5(100) | -22.3( 99) | -18.1(100) | -10.7( 99) | -6.3(100) |
1979 | -4.9(100) | -7.2(100) | -9.9( 99) | -13.5(100) | -19.2( 99) | -19.7(100) | -24.8( 99) | -20.9(100) | -19.2(100) | -17.4(100) | -9.8(100) | -3.0(100) |
1980 | -3.6(100) | -6.2(100) | -8.1( 99) | -13.0( 99) | -15.6( 99) | -21.9(100) | -20.6( 99) | -20.8(100) | -17.7( 99) | -20.0(100) | -9.4( 99) | -5.0(100) |
1981 | -5.2(100) | -5.8(100) | -10.1( 99) | -13.7( 99) | -17.5(100) | -16.6(100) | -19.3( 99) | -18.5(100) | -18.8( 99) | -16.3(100) | -12.0( 99) | -5.6(100) |
1982 | -4.3(100) | -6.0(100) | -12.5(100) | -18.1(100) | -16.9(100) | -16.7(100) | -21.7(100) | -23.0(100) | -21.2(100) | -17.3(100) | -9.8(100) | -3.7(100) |
1983 | -3.6(100) | -5.0(100) | -10.2(100) | -14.8(100) | -15.4(100) | -20.1(100) | -24.4(100) | -24.5(100) | -17.7(100) | -18.1(100) | -11.8(100) | -4.7(100) |
1984 | -4.1(100) | -7.6(100) | -10.9(100) | -17.0(100) | -16.9(100) | -23.8(100) | -25.8(100) | -20.2(100) | -19.5(100) | -15.2(100) | -11.9(100) | -5.0(100) |
1985 | -3.9(100) | -7.0(100) | -10.9(100) | -15.6(100) | -19.4(100) | -20.6(100) | -23.1(100) | -22.5(100) | -22.8(100) | -19.3(100) | -11.4(100) | -5.9(100) |
1986 | -4.3(100) | -6.5(100) | -8.8(100) | -14.1(100) | -16.9(100) | -17.6(100) | -20.4(100) | -21.2(100) | -22.8(100) | -17.1(100) | -11.2(100) | -5.9(100) |
1987 | -4.0(100) | -6.3(100) | -8.9(100) | -14.6(100) | -19.8(100) | -16.6(100) | -18.6(100) | -21.6(100) | -20.6(100) | -15.3(100) | -11.3(100) | -6.2(100) |
1988 | -4.7(100) | -6.7( 99) | -11.4(100) | -14.8( 99) | -20.1(100) | -20.3(100) | -22.3(100) | -21.9(100) | -17.4(100) | -15.5(100) | -10.7( 99) | -5.0(100) |
1989 | -5.2(100) | -8.1(100) | -10.9(100) | -15.6(100) | -21.3(100) | -25.1( 99) | -20.5(100) | -24.1(100) | -18.4(100) | -16.9(100) | -10.9(100) | -4.7(100) |
1990 | -4.1(100) | -7.5(100) | -11.5(100) | -17.8(100) | -16.9(100) | -22.0(100) | -15.9(100) | -23.0(100) | -23.5(100) | -17.4(100) | -10.2(100) | -4.6(100) |
1991 | -4.3(100) | -6.5( 98) | - | - | - | - | - | - | - | - | - | - |
1992 | - | - | - | - | - | - | - | - | - | - | - | - |
1993 | - | - | - | - | - | - | - | - | - | - | - | - |
1994 | - | - | - | - | - | - | - | - | - | - | - | - |
1995 | - | - | - | - | - | - | - | - | - | - | - | - |
1996 | - | - | - | - | - | - | - | - | - | - | - | - |
1997 | - | - | - | - | - | - | - | - | - | - | - | - |
1998 | - | - | - | - | - | - | - | - | - | - | - | - |
1999 | - | - | - | - | - | - | - | - | - | - | - | - |
2000 | - | - | - | - | - | - | - | - | - | - | - | - |
2001 | - | - | - | - | - | - | - | - | - | - | - | - |
2002 | - | - | - | - | - | - | - | - | - | - | - | - |
2003 | - | - | - | - | - | - | - | - | - | - | - | - |
2004 | - | - | - | - | - | - | - | - | - | - | - | - |
2005 | - | - | - | - | - | - | - | - | - | - | - | - |
2006 | - | - | - | - | - | - | - | - | - | - | - | - |
2007 | - | - | - | - | - | - | - | - | - | - | - | - |
2008 | - | - | - | - | - | - | - | - | - | - | - | - |
2009 | - | - | - | - | - | - | - | - | - | - | - | - |
2010 | - | - | - | - | - | - | - | - | - | - | - | - |
2011 | - | - | - | - | - | - | - | - | - | - | - | - |
2012 | - | - | - | - | - | - | - | - | - | - | - | - |
2013 | - | - | - | - | - | - | - | - | - | - | - | - |
2014 | - | - | - | - | - | - | - | - | - | - | - | - |
2015 | - | - | - | - | - | - | - | - | - | - | - | - |
2016 | - | - | - | - | - | - | - | - | - | - | - | - |
2017 | - | - | - | - | - | - | - | - | - | - | - | - |
2018 | - | - | - | - | - | - | - | - | - | - | - | - |
2019 | - | - | - | - | - | - | - | - | - | - | - | - |
2020 | - | - | - | - | - | - | - | - | - | - | - | - |
2021 | - | - | - | - | - | - | - | - | - | - | - | - |
2022 | - | - | - | - | - | - | - | - | - | - | - | - |
2023 | - | - | - | - | - | - | - | - | - | - | - | - |
2024 | - | - | - | - | - | - | - | - | - | - | - | - |