1968 -999.0 -999.0 9.4 9.2 9.2 8.6 8.8 8.3 9.2 8.7 8.6 9.0 1969 9.5 9.5 8.8 8.8 8.5 8.7 8.8 8.9 9.2 9.2 9.6 9.3 1970 9.1 9.6 8.7 8.9 8.0 8.3 9.5 8.7 9.6 9.6 9.2 8.6 1971 9.4 8.4 9.2 8.3 7.6 8.5 7.8 8.2 8.5 9.1 9.2 9.1 1972 9.2 9.8 9.8 9.1 9.3 8.7 9.2 8.6 9.4 9.2 9.6 9.4 1973 9.1 9.1 9.1 9.7 9.1 8.0 8.8 8.2 8.6 9.7 9.4 9.1 1974 9.5 9.4 9.3 9.5 9.0 9.1 8.9 9.3 9.1 9.1 9.5 9.1 1975 8.7 9.5 8.9 8.4 9.0 7.2 7.5 7.7 9.4 9.4 8.5 8.8 1976 9.2 9.3 9.1 9.4 8.8 8.7 9.1 8.4 8.2 8.6 9.1 9.2 1977 8.8 9.2 9.2 9.2 8.6 8.8 7.8 9.2 8.9 8.6 9.6 9.7 1978 9.7 9.4 9.3 9.4 9.4 8.9 7.8 8.6 9.3 9.1 9.2 9.5 1979 8.7 9.1 8.7 8.8 9.0 8.9 8.4 8.1 9.0 8.6 9.1 9.7 1980 9.3 9.8 8.9 9.0 9.7 8.8 8.6 8.7 9.1 8.9 9.5 9.8 1981 9.5 9.3 9.0 9.0 8.1 7.8 8.3 8.1 8.6 9.1 8.9 9.0 1982 9.2 8.7 9.2 8.4 8.6 8.5 7.7 7.5 7.6 7.9 8.6 9.4 1983 9.3 7.8 9.0 8.5 9.3 7.8 8.3 8.4 8.1 9.1 9.5 9.0 1984 8.9 9.3 9.2 8.7 8.2 8.0 7.5 8.6 8.1 9.2 9.0 8.7 1985 9.4 9.4 8.8 8.6 8.4 9.1 8.5 8.9 8.9 8.3 9.6 8.9 1986 9.4 9.1 9.3 9.4 9.3 9.8 8.8 9.3 9.3 9.3 9.8 9.1 1987 9.1 8.5 8.4 9.3 8.5 8.8 8.3 9.0 9.0 8.9 8.8 8.5 1988 9.5 8.7 8.6 8.8 8.2 8.8 8.6 7.7 8.4 8.9 8.9 9.5 1989 7.5 7.5 8.3 8.8 7.3 8.4 7.8 9.1 8.5 9.0 8.7 8.5 1990 9.6 8.9 9.6 8.9 8.6 8.4 8.7 8.5 8.3 9.3 9.2 9.2 1991 9.3 8.9 8.9 9.1 8.4 8.1 8.4 8.8 8.0 9.2 9.1 9.6 1992 9.6 9.0 9.5 9.8 8.9 9.2 9.1 9.6 9.3 9.5 8.9 9.3 1993 9.5 8.7 8.4 8.7 8.6 9.3 9.2 8.6 9.1 9.0 9.2 9.0 1994 9.4 9.5 9.0 9.1 8.6 9.0 9.0 9.2 9.4 9.8 9.2 9.5 1995 9.7 9.7 8.8 9.4 9.1 8.1 9.3 7.9 9.5 8.9 8.9 9.1 1996 8.8 9.0 9.4 8.7 9.0 8.4 9.0 8.6 9.7 8.8 9.0 9.1 1997 9.3 9.7 8.3 8.9 8.1 7.4 8.2 8.8 8.3 8.9 9.2 9.0 1998 9.3 8.0 8.8 7.9 7.3 8.6 7.9 9.0 8.9 9.3 9.0 8.9 1999 8.9 8.8 8.8 8.9 9.0 8.7 9.2 8.7 9.3 8.7 9.3 9.4 2000 8.7 8.7 8.8 8.9 8.9 8.0 8.4 9.3 9.0 9.5 8.6 9.5 2001 9.3 9.7 9.7 9.5 9.7 9.6 9.1 9.3 8.9 9.1 9.4 9.3 2002 9.8 9.7 9.1 9.6 9.6 8.9 9.5 8.9 9.7 9.8 9.7 9.7 2003 9.4 9.5 9.3 9.4 9.0 8.8 9.2 9.4 9.7 9.3 9.3 9.2 2004 9.3 9.4 9.2 9.4 8.8 9.5 9.8 9.1 9.4 8.4 9.2 9.1 2005 9.6 8.9 9.4 8.8 9.5 8.9 9.0 9.0 9.1 8.4 8.7 8.8 2006 8.3 9.5 9.0 8.2 8.8 9.3 9.3 7.8 9.1 8.8 9.3 9.7 2007 8.2 8.8 8.9 9.3 8.9 8.8 8.6 9.3 9.5 9.4 9.3 9.2 2008 9.4 9.1 9.5 9.7 9.1 9.3 9.0 8.8 9.4 9.5 9.5 8.9 2009 9.6 9.6 9.5 8.8 9.3 8.2 8.7 8.9 9.2 9.5 9.3 9.8 2010 9.2 9.6 9.4 9.5 9.4 9.4 9.2 9.5 9.5 9.2 9.3 9.2 2011 9.0 9.4 9.3 9.3 8.9 8.5 8.5 8.5 9.4 9.1 9.2 9.7 2012 9.0 8.4 9.2 9.4 9.3 9.4 9.2 9.3 9.1 9.2 9.6 9.2 2013 9.7 8.9 8.3 8.8 9.1 8.8 9.0 9.0 9.0 9.5 8.7 8.9 2014 9.5 9.5 9.4 9.2 9.4 8.6 9.0 9.3 9.4 9.5 9.7 9.2 2015 9.4 9.3 9.0 9.0 9.1 9.1 8.2 9.2 9.2 9.4 9.6 9.3 2016 9.2 9.2 9.1 8.9 8.5 8.9 8.4 8.4 9.2 9.3 8.6 9.1 2017 9.3 9.5 9.3 8.6 8.9 9.1 8.6 8.7 8.5 9.6 9.2 9.3 2018 9.9 9.5 9.4 9.1 8.7 9.4 8.7 9.4 9.3 9.2 9.4 9.4 2019 9.6 9.0 9.1 9.2 8.9 9.4 8.8 9.3 8.7 9.5 9.3 9.2 2020 9.5 9.0 8.7 9.1 8.4 8.4 9.4 9.5 9.3 9.2 9.2 9.2 2021 9.5 9.3 9.4 9.5 9.5 9.3 8.4 9.0 9.3 9.3 8.7 9.3 2022 9.6 9.7 9.5 9.4 9.2 9.1 9.1 8.8 9.5 8.8 9.5 8.8 2023 9.3 9.1 8.4 8.6 8.8 8.5 7.9 9.1 8.7 9.2 9.1 9.1