Year	Percent
1950	18.43876
1955	17.95588
1960	18.71514
1965	20.65102
1970	20.80356
1975	20.11872
1980	19.90627
1985	19.30983
1990	19.62413
1995	19.96469
2000	18.13566
2005	16.08987
2010	15.43866
2015	14.98862
2020	14.31903
2025	13.38618
2030	12.41321
2035	11.57329
2040	10.90612
2045	10.34797
2050	9.80866
2055	9.25662
2060	8.70352
2065	8.21091
2070	7.77259
2075	7.39535
2080	7.04864
2085	6.72411
2090	6.42591
2095	6.14683
2100	5.91022