Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1971 | - | - | -10.6(100) | -14.6(100) | -16.9(100) | -16.6(100) | -20.2(100) | -19.6(100) | -20.8(100) | -15.5(100) | -10.4(100) | -4.6(100) |
1972 | -2.0(100) | -5.3(100) | -10.9(100) | -13.4(100) | -19.1(100) | -18.5(100) | -18.6(100) | -21.6(100) | -19.9(100) | -18.8(100) | -11.4(100) | -4.4(100) |
1973 | -3.0(100) | -8.1(100) | -11.4(100) | -15.3(100) | -17.5(100) | -19.3(100) | -19.6(100) | -21.3(100) | -21.0(100) | -18.0(100) | -8.5(100) | -4.4(100) |
1974 | -2.6(100) | -7.3(100) | -11.2(100) | -17.5(100) | -18.5(100) | -15.5(100) | -24.6(100) | -20.5(100) | -19.9(100) | -17.5(100) | -8.9(100) | -3.5(100) |
1975 | -3.0(100) | -6.3(100) | -10.8(100) | -16.4(100) | -19.5(100) | -21.5(100) | -18.7(100) | -24.5(100) | -22.2(100) | -19.1(100) | -10.3(100) | -4.5(100) |
1976 | -2.8(100) | -5.6(100) | -11.9(100) | -20.9(100) | -20.7(100) | -23.2(100) | -22.2(100) | -21.3(100) | -22.5(100) | -22.2(100) | -8.8(100) | -2.1(100) |
1977 | -1.9(100) | -6.1(100) | -11.2(100) | -15.9(100) | -20.4(100) | -20.4(100) | -22.9(100) | -19.8(100) | -23.1(100) | -16.6(100) | -9.9(100) | -4.1(100) |
1978 | -4.7(100) | -5.6(100) | -9.1(100) | -13.9(100) | -20.3(100) | -22.6(100) | -17.8(100) | -25.1(100) | -21.9(100) | -17.8(100) | -9.6(100) | -5.3(100) |
1979 | -3.8(100) | -6.1(100) | -9.5(100) | -13.5(100) | -19.0(100) | -19.8(100) | -24.7(100) | -20.9(100) | -18.8(100) | -16.4(100) | -9.0(100) | -2.1(100) |
1980 | -2.5(100) | -5.3(100) | -7.8(100) | -12.5(100) | -15.7(100) | -21.8(100) | -21.2(100) | -20.8(100) | -17.2(100) | -19.1(100) | -8.8(100) | -4.0(100) |
1981 | -4.1(100) | -5.3(100) | -9.6(100) | -13.5(100) | -17.7(100) | -17.1(100) | -18.9(100) | -18.7(100) | -19.0(100) | -15.4(100) | -10.8(100) | -4.3(100) |
1982 | -3.2(100) | -5.2(100) | -12.5(100) | -18.3(100) | -16.8(100) | -16.6(100) | -21.4(100) | -23.0(100) | -20.7(100) | -16.4(100) | -8.8(100) | -2.7(100) |
1983 | -3.0(100) | -4.5(100) | -9.8(100) | -14.4(100) | -15.0(100) | -20.3(100) | -24.2(100) | -25.1(100) | -17.0(100) | -17.2(100) | -10.5(100) | -3.7(100) |
1984 | -3.4(100) | -6.7(100) | -10.4(100) | -16.7(100) | -17.1(100) | -23.5(100) | -25.5(100) | -20.5(100) | -18.6(100) | -14.7(100) | -10.6(100) | -3.9(100) |
1985 | -2.6(100) | -6.4(100) | -10.5(100) | -15.6(100) | -19.6(100) | -20.8(100) | -22.9(100) | -22.4(100) | -22.5(100) | -18.6(100) | -10.3(100) | -4.9(100) |
1986 | -3.3(100) | -5.5(100) | -8.3(100) | -14.1(100) | -16.7(100) | -17.5(100) | -20.4(100) | -20.9(100) | -22.8(100) | -16.3(100) | -10.2(100) | -4.7(100) |
1987 | -2.9(100) | -5.8(100) | -8.8(100) | -14.4(100) | -19.5(100) | -16.6(100) | -18.7(100) | -21.3(100) | -20.2(100) | -15.1(100) | -10.0(100) | -5.1(100) |
1988 | -3.7(100) | -5.9( 97) | -11.2(100) | -14.4( 97) | -20.4(100) | -19.8(100) | -22.3(100) | -22.0(100) | -16.6(100) | -15.0(100) | -9.6(100) | -4.0(100) |
1989 | -4.3(100) | -7.2(100) | -10.3(100) | -15.3(100) | -21.3(100) | -25.5(100) | -20.2(100) | -23.6(100) | -17.9(100) | -16.4(100) | -9.7(100) | -3.9(100) |
1990 | -3.3(100) | -6.6(100) | -11.2(100) | -17.5(100) | -16.8(100) | -22.0(100) | -15.9(100) | -22.9(100) | -22.7(100) | -16.2(100) | -9.2(100) | -3.6(100) |
1991 | -3.6(100) | -5.9(100) | - | - | - | - | - | - | - | - | - | - |
1992 | - | - | - | - | - | - | - | - | - | - | - | - |
1993 | - | - | - | - | - | - | - | - | - | - | - | - |
1994 | - | - | - | - | - | - | - | - | - | - | - | - |
1995 | - | - | - | - | - | - | - | - | - | - | - | - |
1996 | - | - | - | - | - | - | - | - | - | - | - | - |
1997 | - | - | - | - | - | - | - | - | - | - | - | - |
1998 | - | - | - | - | - | - | - | - | - | - | - | - |
1999 | - | - | - | - | - | - | - | - | - | - | - | - |
2000 | - | - | - | - | - | - | - | - | - | - | - | - |
2001 | - | - | - | - | - | - | - | - | - | - | - | - |
2002 | - | - | - | - | - | - | - | - | - | - | - | - |
2003 | - | - | - | - | - | - | - | - | - | - | - | - |
2004 | - | - | - | - | - | - | - | - | - | - | - | - |
2005 | - | - | - | - | - | - | - | - | - | - | - | - |
2006 | - | - | - | - | - | - | - | - | - | - | - | - |
2007 | - | - | - | - | - | - | - | - | - | - | - | - |
2008 | - | - | -12.8( 16) | -18.1( 93) | -22.3( 94) | -21.1( 97) | -24.2( 90) | -20.4(100) | -19.4( 97) | -16.1( 87) | -8.6( 93) | -3.3( 97) |
2009 | -2.3( 97) | - | - | - | - | - | - | - | - | - | - | - |