Year mm per year 1961 1348 1962 1348 1963 1348 1964 1348 1965 1348 1966 1348 1967 1348 1968 1348 1969 1348 1970 1348 1971 1348 1972 1348 1973 1348 1974 1348 1975 1348 1976 1348 1977 1348 1978 1348 1979 1348 1980 1348 1981 1348 1982 1348 1983 1348 1984 1348 1985 1348 1986 1348 1987 1348 1988 1348 1989 1348 1990 1348 1991 1348 1992 1348 1993 1348 1994 1348 1995 1348 1996 1348 1997 1348 1998 1348 1999 1348 2000 1348 2001 1348 2002 1348 2003 1348 2004 1348 2005 1348 2006 1348 2007 1348 2008 1348 2009 1348 2010 1348 2011 1348 2012 1348 2013 1348 2014 1348 2015 1348 2016 1348 2017 1348 2018 1348 2019 1348 2020 1348