Year	Percent
1950	11.43485
1955	12.52854
1960	13.47128
1965	14.15609
1970	14.83005
1975	15.18982
1980	15.58104
1985	16.44906
1990	17.2269
1995	18.74266
2000	20.74629
2005	23.26044
2010	24.27874
2015	24.51282
2020	23.78043
2025	22.38263
2030	21.99725
2035	22.58745
2040	23.94796
2045	25.18155
2050	25.38373
2055	24.90544
2060	24.32602
2065	23.95649
2070	23.96249
2075	23.93163
2080	23.67462
2085	23.19499
2090	22.69661
2095	22.35049
2100	22.16966