Year	Percent
1950	17.82463
1955	18.06844
1960	18.2276
1965	18.54076
1970	18.84213
1975	18.96402
1980	18.76332
1985	18.0822
1990	17.35675
1995	17.15348
2000	16.91897
2005	16.45995
2010	15.78886
2015	14.88963
2020	14.1967
2025	13.62222
2030	13.12439
2035	12.5696
2040	11.94622
2045	11.32376
2050	10.76783
2055	10.28981
2060	9.87265
2065	9.48656
2070	9.08774
2075	8.68607
2080	8.30815
2085	7.97459
2090	7.67861
2095	7.38106
2100	7.10769