time 0 1955 -999.9 1956 24.7 1957 69.9 1958 20.7 1959 87.6 1960 23.1 1961 -999.9 1962 3.2 1963 33.5 1964 71.8 1965 38.5 1966 53.2 1967 120.4 1968 122.7 1969 108.5 1970 39.6 1971 -999.9 1972 78.9 1973 191.1 1974 69.3 1975 98.0 1976 73.6 1977 145.5 1978 271.9 1979 38.4 1980 23.4 1981 59.2 1982 88.5 1983 72.8 1984 130.0 1985 41.1 1986 -999.9 1987 38.2 1988 -999.9 1989 58.7 1990 32.6 1991 71.1 1992 10.6 1993 -999.9 1994 86.4 1995 111.7 1996 109.0 1997 80.9 1998 157.9 1999 37.4 2000 74.1 2001 50.6 2002 -999.9 2003 62.9 2004 135.5 2005 100.9 2006 42.7 2007 18.8 2008 66.4 2009 49.8 2010 97.1 2011 68.8 2012 91.0 2013 198.3 2014 160.0 2015 37.0 2016 37.3 2017 174.3 2018 136.4 2019 134.7 2020 93.6 2021 78.7 2022 312.8