Annual % of land area
1961 0.07040270346381301
1962 0.07040270346381301
1963 0.07040270346381301
1964 0.07040270346381301
1965 0.07040270346381301
1966 0.08448324415657561
1967 0.08448324415657561
1968 0.08448324415657561
1969 0.08448324415657561
1970 0.09856378484933823
1971 0.09856378484933823
1972 0.09856378484933823
1973 0.11264432554210081
1974 0.12672486623486343
1975 0.15488594762038863
1976 0.15488594762038863
1977 0.16896648831315123
1978 0.16896648831315123
1979 0.16896648831315123
1980 0.22528865108420162
1981 0.26753027316248945
1982 0.25344973246972685
1983 0.32385243593353985
1984 0.33793297662630245
1985 0.36609405801182765
1986 0.40833568009011545
1987 0.40833568009011545
1988 0.40833568009011545
1989 0.40833568009011545
1990 0.49281892424669105
1991 0.49281892424669105
1992 0.5350605463249789
1993 0.5632216277105041
1994 0.5913827090960293
1995 0.605463249788792
1996 0.6477048718670797
1997 0.6336243311743172
1998 0.5068994649394537
1999 0.605463249788792
2000 0.8448324415657561
2001 0.9997183891861448
2002 1.0560405519571952
2003 0.9011546043368065
2004 0.8870740636440438
2005 0.9574767671078569
2006 0.7124753590537877
2007 0.6279921148972121
2008 0.7265558997465502
2009 0.7026189805688539
2010 0.7124753590537877
2011 0.6350323852435933
2012 0.5223880597014926
2013 0.5280202759785976
2014 0.6195437904815545
2015 0.6209518445508307
2016 0.6265840608279358
2017 0.6265840608279358
2018 0.595606871303858
2019 0.7026189805688539
2020 0.6899464939453674
2021 0.7082511968459589