1958 -30.9 -44.6 -57.0 -63.8 -62.5 -67.9 -65.3 -71.7 -66.1 -58.6 -43.2 -33.2 1959 -34.3 -43.7 -52.9 -61.8 -64.7 -66.3 -68.4 -69.5 -68.4 -57.6 -44.5 -32.1 1960 -33.4 -43.7 -61.8 -67.6 -67.8 -70.7 -68.3 -70.9 -66.5 -58.6 -44.8 -33.2 1961 -32.9 -43.0 -57.7 -65.2 -65.3 -60.0 -64.1 -67.1 -62.6 -54.8 -43.4 -34.0 1962 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 1963 -999.0 -45.3 -59.3 -64.3 -66.0 -65.0 -63.9 -63.7 -57.5 -58.0 -45.2 -33.4 1964 -32.4 -46.3 -61.1 -69.3 -68.8 -61.1 -66.6 -61.9 -70.4 -58.2 -42.3 -32.4 1965 -33.6 -43.1 -58.9 -65.9 -64.1 -66.7 -69.3 -66.1 -66.9 -56.8 -44.0 -33.3 1966 -35.5 -42.7 -54.2 -66.9 -67.2 -68.9 -67.3 -71.5 -67.8 -56.8 -42.9 -31.6 1967 -30.4 -45.7 -54.8 -66.3 -69.2 -66.9 -67.3 -73.0 -64.6 -57.1 -41.3 -31.1 1968 -33.3 -44.6 -57.9 -62.5 -65.0 -63.7 -71.2 -70.2 -71.5 -53.5 -42.5 -33.0 1969 -32.6 -43.8 -59.8 -63.0 -66.8 -62.4 -69.3 -69.5 -69.8 -55.5 -43.7 -32.5 1970 -31.8 -44.0 -55.8 -64.6 -66.1 -62.7 -67.2 -70.1 -64.1 -55.5 -44.4 -32.1 1971 -30.1 -41.5 -58.2 -65.3 -63.5 -65.6 -69.1 -66.7 -63.3 -56.2 -43.4 -30.6 1972 -31.1 -44.9 -57.7 -65.1 -65.8 -66.4 -68.8 -61.5 -62.5 -56.4 -43.8 -33.6 1973 -34.1 -44.4 -59.0 -60.3 -63.6 -64.6 -68.4 -71.5 -62.7 -56.0 -40.5 -33.8 1974 -29.4 -46.6 -62.0 -68.4 -66.8 -62.9 -66.1 -68.3 -68.7 -55.2 -41.9 -31.9 1975 -32.1 -45.5 -56.0 -63.5 -61.7 -66.5 -69.5 -73.2 -69.9 -56.1 -42.0 -33.1 1976 -32.4 -43.5 -58.0 -66.3 -70.5 -64.7 -62.8 -65.4 -68.1 -57.4 -42.4 -28.9 1977 -30.0 -43.3 -57.3 -67.0 -62.5 -64.5 -64.0 -67.3 -71.1 -59.2 -45.2 -31.5 1978 -34.5 -43.6 -58.7 -64.7 -64.5 -64.5 -63.2 -73.5 -64.3 -58.7 -41.9 -29.9 1979 -31.9 -45.9 -60.5 -62.2 -69.4 -69.4 -72.3 -68.3 -67.7 -61.2 -43.9 -31.0 1980 -30.0 -43.3 -54.5 -61.8 -65.3 -61.7 -64.6 -61.9 -62.9 -58.0 -42.5 -31.7 1981 -33.2 -44.9 -56.6 -66.7 -69.5 -66.4 -63.0 -60.7 -61.4 -58.8 -44.2 -31.5 1982 -32.7 -44.4 -63.9 -65.3 -63.7 -67.9 -63.2 -72.4 -71.3 -57.3 -38.8 -31.2 1983 -31.5 -44.6 -58.0 -63.5 -60.4 -61.9 -73.8 -67.1 -60.8 -57.4 -45.4 -33.2 1984 -32.1 -47.4 -57.2 -62.8 -61.0 -70.8 -65.5 -68.1 -63.1 -58.0 -41.8 -30.4 1985 -31.2 -46.7 -59.7 -62.2 -68.1 -66.6 -70.4 -66.3 -66.6 -58.3 -44.7 -32.4 1986 -30.8 -39.4 -59.1 -66.7 -66.7 -70.6 -68.0 -69.3 -66.3 -56.9 -43.0 -32.0 1987 -31.1 -45.7 -57.0 -64.4 -66.8 -59.7 -65.8 -75.4 -67.0 -56.2 -45.0 -32.5 1988 -31.6 -45.9 -56.2 -65.5 -63.4 -63.9 -70.6 -66.7 -65.8 -55.3 -43.2 -33.6 1989 -34.6 -45.0 -56.8 -66.5 -68.9 -68.5 -67.3 -64.7 -61.2 -54.3 -42.6 -28.0 1990 -30.4 -44.4 -59.2 -61.8 -66.8 -65.5 -66.2 -69.4 -66.0 -56.0 -41.2 -28.8 1991 -32.2 -42.0 -57.3 -62.1 -68.3 -62.3 -58.6 -67.5 -67.8 -58.9 -42.9 -30.4 1992 -32.7 -41.2 -57.3 -65.8 -66.1 -63.4 -67.8 -63.3 -67.6 -58.2 -42.1 -33.1 1993 -30.8 -43.5 -57.3 -67.0 -68.3 -68.4 -70.6 -70.7 -68.4 -55.9 -42.5 -33.0 1994 -31.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -33.2 1995 -33.5 -43.6 -57.8 -65.6 -69.1 -67.6 -56.7 -67.7 -68.7 -57.6 -42.8 -31.9 1996 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 1997 -33.5 -44.8 -58.2 -64.4 -67.9 -64.1 -72.9 -71.5 -65.9 -58.0 -39.7 -30.4 1998 -33.6 -43.9 -60.4 -68.5 -65.5 -67.2 -66.7 -67.1 -71.8 -60.3 -42.6 -31.5 1999 -31.7 -45.2 -57.9 -70.4 -70.2 -64.6 -69.8 -67.8 -67.9 -58.7 -43.2 -35.1 2000 -33.5 -45.2 -60.9 -65.1 -68.0 -60.0 -66.7 -66.8 -66.2 -61.3 -40.8 -30.6 2001 -31.5 -43.3 -58.3 -63.1 -63.4 -66.9 -66.5 -69.1 -65.7 -56.4 -40.6 -30.5 2002 -29.0 -45.7 -56.9 -61.9 -59.4 -65.9 -64.9 -71.6 -67.8 -55.7 -43.8 -34.0 2003 -31.8 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 -999.0 2004 -999.0 -999.0 -57.2 -62.4 -64.4 -65.8 -70.3 -62.4 -65.9 -56.7 -42.1 -29.6 2005 -31.3 -44.5 -56.3 -65.8 -67.2 -63.9 -63.2 -68.1 -63.4 -54.8 -42.3 -29.2 2006 -32.6 -44.3 -58.2 -62.4 -66.3 -64.2 -67.0 -65.5 -64.4 -57.2 -43.2 -32.6 2007 -32.6 -45.8 -56.2 -61.9 -59.2 -59.3 -64.7 -63.8 -64.0 -55.5 -42.5 -32.7 2008 -33.3 -46.0 -54.2 -63.5 -66.7 -70.5 -65.2 -69.9 -67.8 -58.3 -40.4 -30.9 2009 -31.0 -40.4 -57.5 -67.6 -62.9 -61.8 -59.5 -67.9 -64.2 -57.1 -40.8 -31.8 2010 -30.2 -43.6 -55.7 -67.5 -64.7 -68.9 -69.4 -70.9 -65.3 -58.1 -43.9 -30.8 2011 -30.6 -42.1 -57.9 -61.3 -67.8 -68.7 -61.7 -60.6 -63.9 -55.5 -40.7 -30.7 2012 -31.6 -45.9 -58.4 -65.2 -67.6 -68.7 -69.8 -70.9 -70.0 -54.7 -40.9 -29.8 2013 -32.2 -47.0 -61.1 -64.1 -67.3 -61.8 -65.9 -62.9 -59.7 -55.4 -39.8 -30.6 2014 -30.0 -44.5 -59.3 -65.3 -62.4 -62.9 -68.3 -65.1 -62.1 -54.4 -40.3 -32.3 2015 -32.1 -44.2 -57.4 -65.1 -70.4 -64.3 -66.0 -70.1 -66.4 -52.8 -40.1 -30.3 2016 -32.8 -44.4 -60.3 -66.2 -64.5 -70.7 -71.8 -63.2 -65.7 -57.6 -40.0 -31.5 2017 -31.1 -43.4 -58.7 -67.3 -64.0 -69.4 -65.4 -65.6 -66.4 -51.2 -40.2 -32.4 2018 -31.9 -44.3 -56.3 -62.2 -60.2 -62.8 -65.0 -63.6 -63.7 -53.9 -42.2 -28.8 2019 -33.5 -41.6 -58.3 -66.1 -68.4 -69.6 -64.5 -65.0 -64.8 -53.6 -41.0 -30.2 2020 -30.7 -44.1 -60.6 -61.7 -63.0 -65.1 -62.0 -65.8 -59.0 -56.5 -38.6 -31.7 2021 -31.9 -45.0 -57.3 -63.8 -68.2 -69.7 -66.0 -63.1 -62.9 -53.3 -41.9 -29.1 2022 -32.6 -41.9 -53.3 -67.4 -64.7 -61.4 -66.6 -66.9 -67.6 -56.5 -44.5 -34.1 2023 -34.4 -43.1 -58.1 -62.3 -68.3 -62.9 -65.9 -71.2 -63.7 -58.0 -45.4 -34.2