Year	Percent
1950	17.75718
1955	19.17508
1960	20.73215
1965	19.61828
1970	17.36659
1975	15.53603
1980	12.48213
1985	13.15073
1990	12.99463
1995	12.45791
2000	11.57266
2005	10.60102
2010	9.79184
2015	9.35117
2020	8.79578
2025	8.25494
2030	7.759
2035	7.33692
2040	6.97713
2045	6.69456
2050	6.45834
2055	6.25143
2060	6.05107
2065	5.8693
2070	5.71086
2075	5.57461
2080	5.47219
2085	5.38106
2090	5.29958
2095	5.21958
2100	5.14777