Year	Percent
1950	11.52472
1955	11.93772
1960	13.33815
1965	15.10248
1970	16.72109
1975	17.31987
1980	14.79103
1985	15.42672
1990	17.86461
1995	18.00925
2000	18.17321
2005	19.83076
2010	22.39781
2015	24.86723
2020	26.27788
2025	27.46063
2030	28.74744
2035	31.38428
2040	34.36784
2045	35.71014
2050	36.70821
2055	37.04142
2060	35.90591
2065	34.97288
2070	34.94936
2075	34.91074
2080	35.01145
2085	35.1453
2090	35.18063
2095	35.22515
2100	35.53126