Year	Percent
1950	14.61053
1955	14.56812
1960	14.45628
1965	14.26895
1970	14.10224
1975	13.8687
1980	13.48685
1985	12.89183
1990	12.27087
1995	12.07241
2000	12.0624
2005	12.28154
2010	12.70062
2015	13.24232
2020	14.07202
2025	15.12624
2030	16.02851
2035	16.67761
2040	17.12316
2045	17.53908
2050	18.34035
2055	19.42235
2060	20.3724
2065	21.08302
2070	21.46552
2075	21.66741
2080	21.98752
2085	22.38838
2090	22.78069
2095	23.0747
2100	23.26108