Year	Percent
1950	15.08461
1955	15.16837
1960	15.02636
1965	14.73445
1970	14.13673
1975	13.39439
1980	12.70485
1985	11.98352
1990	11.26535
1995	11.55043
2000	11.37287
2005	11.94493
2010	12.47221
2015	11.8361
2020	11.53294
2025	12.28314
2030	13.72369
2035	15.13377
2040	15.73871
2045	15.90768
2050	16.28781
2055	17.12086
2060	18.38275
2065	19.50859
2070	20.15163
2075	20.59782
2080	21.07963
2085	21.71458
2090	22.39211
2095	22.91467
2100	23.21037