Year	Percent
1950	13.28429
1955	13.06683
1960	12.69812
1965	14.06098
1970	14.35087
1975	15.71601
1980	15.12886
1985	14.03478
1990	12.97693
1995	12.53901
2000	12.02108
2005	12.39934
2010	11.81977
2015	11.70578
2020	12.4817
2025	11.42182
2030	10.33593
2035	9.83953
2040	9.70095
2045	9.78697
2050	9.65316
2055	9.15104
2060	8.45641
2065	7.88389
2070	7.60814
2075	7.48337
2080	7.30831
2085	6.96205
2090	6.52655
2095	6.13299
2100	5.89152