Year	Percent
1950	17.25592
1955	19.6941
1960	19.80505
1965	20.26436
1970	21.00096
1975	20.25654
1980	19.90505
1985	19.3392
1990	15.9966
1995	13.91921
2000	12.99891
2005	11.76557
2010	10.25828
2015	10.1892
2020	9.25404
2025	8.37175
2030	7.58363
2035	6.90041
2040	6.41952
2045	6.22927
2050	6.0898
2055	5.93976
2060	5.73659
2065	5.53558
2070	5.39725
2075	5.32875
2080	5.31655
2085	5.29964
2090	5.25163
2095	5.18104
2100	5.10901