Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1971 | - | - | 14.1(100) | 15.0(100) | 15.1(100) | 11.4(100) | 23.2(100) | 15.3(100) | 16.1(100) | 15.1(100) | 12.7(100) | 18.6(100) |
1972 | 23.1(100) | 17.1(100) | 18.6(100) | 19.9(100) | 12.8(100) | 17.2(100) | 17.5(100) | 14.6(100) | 17.5(100) | 12.4(100) | 14.5(100) | 22.5(100) |
1973 | 15.7(100) | 15.2(100) | 15.1(100) | 18.6(100) | 15.8(100) | 17.9(100) | 14.9(100) | 12.6(100) | 16.2(100) | 13.5(100) | 16.0(100) | 11.8(100) |
1974 | 11.5(100) | 13.5(100) | 15.2(100) | 15.3(100) | 13.5(100) | 16.9(100) | 12.9(100) | 16.9(100) | 16.4(100) | 13.7(100) | 14.6(100) | 13.1(100) |
1975 | 12.7(100) | 14.7(100) | 15.2(100) | 15.7(100) | 12.4(100) | 13.5(100) | 10.8(100) | 20.7(100) | 16.8(100) | 11.3(100) | 17.1(100) | 12.3(100) |
1976 | 16.4(100) | 13.5(100) | 17.6(100) | 20.4(100) | 19.5(100) | 21.6(100) | 24.0(100) | 16.0(100) | 13.1(100) | 13.4(100) | 13.6(100) | 15.8(100) |
1977 | 12.7(100) | 18.0(100) | 18.5(100) | 21.4(100) | 10.7(100) | 21.3(100) | 10.8(100) | 16.8(100) | 21.4(100) | 15.7(100) | 17.5(100) | 14.5(100) |
1978 | 18.2(100) | 19.8(100) | 21.5(100) | 24.2(100) | 16.1(100) | 14.5(100) | 15.0(100) | 19.6(100) | 14.9(100) | 17.0(100) | 15.6(100) | 13.0(100) |
1979 | 18.7(100) | 18.2(100) | 15.7(100) | 19.9(100) | 16.9(100) | 17.9(100) | 17.8(100) | 13.4(100) | 19.2(100) | 14.7(100) | 19.1(100) | 18.2(100) |
1980 | 14.2(100) | 13.2(100) | 25.7(100) | 16.7(100) | 13.9(100) | 15.0(100) | 13.1(100) | 16.1(100) | 17.5(100) | 14.9(100) | 20.3(100) | 13.3(100) |
1981 | 14.2(100) | 21.6(100) | 15.8(100) | 14.2(100) | 16.3(100) | 13.6(100) | 13.4(100) | 17.9(100) | 20.7(100) | 21.6(100) | 13.5(100) | 13.6(100) |
1982 | 9.6(100) | 11.1(100) | 15.3(100) | 19.9(100) | 17.0(100) | 13.3(100) | 12.6(100) | 14.4(100) | 21.2(100) | 14.5(100) | 16.2(100) | 13.5(100) |
1983 | 20.3(100) | 19.5(100) | 18.8(100) | 18.3(100) | 17.7(100) | 13.8(100) | 13.8(100) | 17.2(100) | 18.7(100) | 15.7(100) | 15.0(100) | 19.0(100) |
1984 | 13.6(100) | 18.3(100) | 14.1(100) | 14.1(100) | 11.5(100) | 11.6(100) | 13.1(100) | 14.7(100) | 17.7(100) | 15.5(100) | 13.6(100) | 16.0(100) |
1985 | 11.5(100) | 16.4(100) | 12.6(100) | 13.4(100) | 20.5(100) | 13.8(100) | 17.5(100) | 15.6(100) | 13.8(100) | 12.6(100) | 13.4(100) | 17.9(100) |
1986 | 15.0(100) | 11.7(100) | 22.8(100) | 20.1(100) | 15.5(100) | 25.6(100) | 15.9(100) | 17.8(100) | 18.2(100) | 14.9(100) | 9.7(100) | 11.3(100) |
1987 | 14.2(100) | 15.1(100) | 22.1(100) | 20.0(100) | 22.2(100) | 17.6(100) | 18.3(100) | 17.7(100) | 18.4(100) | 13.5(100) | 14.6(100) | 12.6(100) |
1988 | 15.0(100) | 17.5( 97) | 18.9(100) | 18.7( 97) | 18.9(100) | 13.9(100) | 14.0(100) | 18.2(100) | 78.5(100) | 18.5(100) | 13.3(100) | 14.7(100) |
1989 | 12.3(100) | 11.5(100) | 19.5(100) | 16.5(100) | 15.5(100) | 12.2(100) | 17.0(100) | 16.0(100) | 15.1(100) | 15.0(100) | 12.2(100) | 14.7(100) |
1990 | 14.0(100) | 16.6(100) | 16.4(100) | 16.7(100) | 23.4(100) | 15.6(100) | 15.9(100) | 13.7(100) | 15.9(100) | 11.2(100) | 14.0(100) | 10.4(100) |
1991 | 15.7(100) | 13.1(100) | - | - | - | - | - | - | - | - | - | - |
1992 | - | - | - | - | - | - | - | - | - | - | - | - |
1993 | - | - | - | - | - | - | - | - | - | - | - | - |
1994 | - | - | - | - | - | - | - | - | - | - | - | - |
1995 | - | - | - | - | - | - | - | - | - | - | - | - |
1996 | - | - | - | - | - | - | - | - | - | - | - | - |
1997 | - | - | - | - | - | - | - | - | - | - | - | - |
1998 | - | - | - | - | - | - | - | - | - | - | - | - |
1999 | - | - | - | - | - | - | - | - | - | - | - | - |
2000 | - | - | - | - | - | - | - | - | - | - | - | - |
2001 | - | - | - | - | - | - | - | - | - | - | - | - |
2002 | - | - | - | - | - | - | - | - | - | - | - | - |
2003 | - | - | - | - | - | - | - | - | - | - | - | - |
2004 | - | - | - | - | - | - | - | - | - | - | - | - |
2005 | - | - | - | - | - | - | - | - | - | - | - | - |
2006 | - | - | - | - | - | - | - | - | - | - | - | - |
2007 | - | - | - | - | - | - | - | - | - | - | - | - |
2008 | - | - | 13.6( 16) | 4.3( 93) | 6.0( 94) | 5.1( 97) | 5.8( 90) | 6.4(100) | 7.1( 97) | 8.3( 87) | 7.3( 93) | 7.2( 97) |
2009 | 7.8( 97) | - | - | - | - | - | - | - | - | - | - | - |