Year	Percent
1950	13.30681
1955	13.55375
1960	13.73178
1965	13.90447
1970	14.12633
1975	14.3939
1980	14.61767
1985	14.79261
1990	14.80532
1995	14.75876
2000	14.5661
2005	14.2628
2010	13.94954
2015	13.64806
2020	13.58321
2025	13.67558
2030	14.06746
2035	14.75581
2040	15.59701
2045	16.35762
2050	16.99218
2055	17.64295
2060	18.30386
2065	19.02523
2070	19.74334
2075	20.36267
2080	20.89935
2085	21.41338
2090	21.91089
2095	22.37954
2100	22.82973