Year	Percent
1950	14.01699
1955	16.28111
1960	15.85106
1965	15.51272
1970	15.57768
1975	15.78943
1980	16.099
1985	16.11645
1990	15.86736
1995	15.43943
2000	14.46585
2005	12.91049
2010	11.18781
2015	9.23347
2020	8.71758
2025	8.14975
2030	7.43414
2035	6.63723
2040	5.99257
2045	5.57645
2050	5.26944
2055	5.00094
2060	4.74495
2065	4.52229
2070	4.35708
2075	4.25174
2080	4.20079
2085	4.17552
2090	4.16111
2095	4.15061
2100	4.14671