Year	Percent
1950	15.73469
1955	17.63414
1960	17.14466
1965	16.47295
1970	15.85089
1975	15.45644
1980	14.82819
1985	13.71859
1990	12.20472
1995	11.0093
2000	10.50739
2005	9.61528
2010	8.87324
2015	8.61151
2020	7.61261
2025	7.12328
2030	6.65643
2035	6.277
2040	5.95035
2045	5.68738
2050	5.43946
2055	5.20725
2060	5.01201
2065	4.87583
2070	4.77733
2075	4.71481
2080	4.65086
2085	4.59056
2090	4.5347
2095	4.49817
2100	4.48283