Year	Percent
1950	11.61481
1955	12.26334
1960	13.01378
1965	13.59924
1970	14.2911
1975	14.90903
1980	15.19718
1985	15.55916
1990	17.69673
1995	17.23177
2000	17.46248
2005	19.25337
2010	21.61041
2015	23.22438
2020	24.71116
2025	26.35637
2030	28.11152
2035	28.68809
2040	28.93605
2045	28.55809
2050	28.8608
2055	29.884
2060	30.58572
2065	30.93588
2070	31.52393
2075	31.63182
2080	31.90716
2085	32.39728
2090	32.967
2095	33.52841
2100	34.04533