Annual % of land area
1961 15.327793167128348
1962 15.327793167128348
1963 15.327793167128348
1964 15.327793167128348
1965 13.850415512465375
1966 13.850415512465375
1967 14.312096029547552
1968 14.312096029547552
1969 14.312096029547552
1970 13.388734995383194
1971 13.388734995383194
1972 13.388734995383194
1973 13.388734995383194
1974 13.388734995383194
1975 13.388734995383194
1976 13.388734995383194
1977 13.388734995383194
1978 13.388734995383194
1979 12.465373961218837
1980 12.465373961218837
1981 12.465373961218837
1982 11.542012927054477
1983 10.61865189289012
1984 10.61865189289012
1985 10.61865189289012
1986 10.61865189289012
1987 10.61865189289012
1988 10.61865189289012
1989 11.080332409972298
1990 10.987996306555864
1991 11.634349030470915
1992 12.557710064635272
1993 16.06648199445983
1994 14.866112650046167
1995 14.58910433979686
1996 14.312096029547552
1997 13.850415512465375
1998 13.388734995383194
1999 13.204062788550322
2000 12.927054478301015
2001 12.927054478301015
2002 12.465373961218837
2003 12.465373961218837
2004 12.280701754385964
2005 11.819021237303785
2006 11.819021237303785
2007 11.542012927054477
2008 11.080332409972298
2009 11.080332409972298
2010 11.080332409972298
2011 11.080332409972298
2012 11.080332409972298
2013 11.080332409972298
2014 11.080332409972298
2015 11.080332409972298
2016 11.080332409972298
2017 11.080332409972298
2018 11.080332409972298
2019 11.080332409972298
2020 11.080332409972298
2021 11.080332409972298