Annual % of land area
1961 14.325248250040698
1962 14.32117857724239
1963 14.223506430083022
1964 14.125834282923652
1965 14.032231808562592
1966 13.934559661403224
1967 13.836887514243854
1968 13.739215367084487
1969 13.641543219925117
1970 13.547940745564057
1971 13.450268598404689
1972 13.352596451245319
1973 13.254924304085952
1974 13.161321829724889
1975 13.063649682565522
1976 12.965977535406154
1977 12.868305388246783
1978 12.770633241087417
1979 12.677030766726356
1980 12.579358619566989
1981 12.481686472407619
1982 12.38401432524825
1983 12.286342178088882
1984 12.19273970372782
1985 12.095067556568452
1986 11.997395409409084
1987 11.899723262249715
1988 11.806120787888654
1989 11.708448640729285
1990 11.610776493569917
1991 11.513104346410548
1992 11.41543219925118
1993 11.321829724890119
1994 11.22415757773075
1995 11.126485430571382
1996 11.130555103369689
1997 11.134624776167996
1998 11.138694448966303
1999 11.14276412176461
2000 11.146833794562918
2001 11.150903467361225
2002 11.154973140159532
2003 11.159042812957837
2004 11.163112485756145
2005 11.154973140159532
2006 11.191600195344293
2007 11.395083835259644
2008 11.598567475174997
2009 11.598567475174997
2010 11.802051115090347
2011 11.802051115090347
2012 12.209018394921047
2013 12.615985674751752
2014 12.615985674751752
2015 12.615985674751752
2016 12.615985674751752
2017 12.615985674751752
2018 12.615985674751752
2019 12.615985674751752
2020 12.615985674751752
2021 12.615985674751752