Year	Percent
1950	16.07843
1955	14.61479
1960	13.30086
1965	12.24327
1970	11.68465
1975	11.34522
1980	10.70774
1985	9.91476
1990	9.80262
1995	10.30004
2000	10.74687
2005	11.21194
2010	11.7225
2015	12.76263
2020	14.29291
2025	16.05915
2030	17.61054
2035	18.45609
2040	19.31756
2045	20.14256
2050	21.10363
2055	22.02733
2060	22.62529
2065	23.0331
2070	23.31158
2075	23.72879
2080	24.09375
2085	24.35151
2090	24.49759
2095	24.55768
2100	24.57581