Year	Percent
1950	12.27019
1955	12.82578
1960	13.12855
1965	13.06914
1970	12.92845
1975	12.73548
1980	12.17505
1985	12.40366
1990	12.6243
1995	12.70721
2000	13.28633
2005	14.3226
2010	15.44945
2015	16.89672
2020	18.7191
2025	20.15827
2030	22.59152
2035	24.49451
2040	25.77536
2045	26.83309
2050	26.60355
2055	26.54684
2060	26.52118
2065	26.60541
2070	26.89299
2075	26.97262
2080	26.83281
2085	26.50382
2090	26.11507
2095	25.79933
2100	25.58547