Year mm per year 1961 1343 1962 1343 1963 1343 1964 1343 1965 1343 1966 1343 1967 1343 1968 1343 1969 1343 1970 1343 1971 1343 1972 1343 1973 1343 1974 1343 1975 1343 1976 1343 1977 1343 1978 1343 1979 1343 1980 1343 1981 1343 1982 1343 1983 1343 1984 1343 1985 1343 1986 1343 1987 1343 1988 1343 1989 1343 1990 1343 1991 1343 1992 1343 1993 1343 1994 1343 1995 1343 1996 1343 1997 1343 1998 1343 1999 1343 2000 1343 2001 1343 2002 1343 2003 1343 2004 1343 2005 1343 2006 1343 2007 1343 2008 1343 2009 1343 2010 1343 2011 1343 2012 1343 2013 1343 2014 1343 2015 1343 2016 1343 2017 1343 2018 1343 2019 1343 2020 1343