Year	Percent
1950	14.5912
1955	16.85751
1960	16.7639
1965	16.69308
1970	16.92243
1975	17.95977
1980	18.61668
1985	19.0377
1990	19.43919
1995	19.85617
2000	19.98523
2005	19.75605
2010	19.12617
2015	18.4217
2020	17.62377
2025	16.76708
2030	15.88664
2035	14.98016
2040	14.09487
2045	13.24341
2050	12.44564
2055	11.71452
2060	11.05557
2065	10.45176
2070	9.89082
2075	9.36163
2080	8.88494
2085	8.44178
2090	8.0291
2095	7.66284
2100	7.31593