Year	Percent
1950	14.88206
1955	14.90535
1960	14.83398
1965	17.88651
1970	20.36435
1975	20.10171
1980	20.61774
1985	18.01823
1990	17.88957
1995	17.74461
2000	16.98832
2005	17.56166
2010	16.88745
2015	16.04133
2020	14.98204
2025	14.25044
2030	13.67518
2035	13.07143
2040	12.42823
2045	11.82343
2050	11.24745
2055	10.72474
2060	10.24247
2065	9.82028
2070	9.43722
2075	9.06846
2080	8.70079
2085	8.3664
2090	8.04095
2095	7.74955
2100	7.47332