Year	Percent
1950	10.20652
1955	9.22177
1960	8.91244
1965	8.92175
1970	10.74035
1975	11.07873
1980	10.7569
1985	10.913
1990	14.30038
1995	16.65994
2000	18.46971
2005	19.01004
2010	20.00461
2015	22.44839
2020	24.63051
2025	26.77593
2030	28.09278
2035	29.80112
2040	31.45511
2045	33.27031
2050	34.46425
2055	35.70703
2060	36.75794
2065	37.43199
2070	38.17501
2075	38.67022
2080	38.96233
2085	39.17228
2090	39.35192
2095	39.52666
2100	39.75016