Year	Percent
1950	12.07877
1955	12.23433
1960	14.29848
1965	14.03676
1970	13.57733
1975	13.16286
1980	13.07268
1985	12.54605
1990	11.86473
1995	10.70468
2000	9.73222
2005	9.3722
2010	8.6438
2015	8.15099
2020	7.84938
2025	7.08778
2030	6.64658
2035	6.20083
2040	5.88061
2045	5.60934
2050	5.39735
2055	5.19643
2060	5.00688
2065	4.8471
2070	4.73884
2075	4.66139
2080	4.61489
2085	4.56302
2090	4.51334
2095	4.46509
2100	4.43422