Year	Percent
1950	12.51728
1955	12.08848
1960	11.7782
1965	12.7673
1970	13.88064
1975	15.31572
1980	14.8866
1985	15.7225
1990	20.5988
1995	21.64942
2000	23.32785
2005	22.72067
2010	23.27805
2015	24.75762
2020	27.22685
2025	29.47156
2030	30.77267
2035	32.10214
2040	33.28432
2045	34.80253
2050	36.3163
2055	36.41716
2060	35.21891
2065	34.003
2070	33.57568
2075	33.90816
2080	34.1918
2085	34.34469
2090	34.32113
2095	34.33647
2100	34.61641