Year	Percent
1950	16.25396
1955	20.00545
1960	19.40919
1965	19.2884
1970	19.16437
1975	19.72087
1980	20.27206
1985	20.00742
1990	20.03428
1995	19.61997
2000	19.20812
2005	19.33244
2010	19.30792
2015	18.5158
2020	17.65118
2025	16.96464
2030	16.35031
2035	15.70114
2040	15.01178
2045	14.29193
2050	13.58048
2055	12.91527
2060	12.30079
2065	11.73361
2070	11.19596
2075	10.67399
2080	10.18396
2085	9.73389
2090	9.30794
2095	8.91143
2100	8.53262