Year	Percent
1950	12.05672
1955	13.57057
1960	15.27388
1965	15.3084
1970	15.71876
1975	14.05012
1980	13.21593
1985	12.80253
1990	12.54944
1995	12.07976
2000	11.25903
2005	10.55364
2010	9.35408
2015	8.02987
2020	7.8536
2025	7.74493
2030	7.51765
2035	7.00545
2040	6.38882
2045	5.9134
2050	5.68266
2055	5.63842
2060	5.60973
2065	5.48647
2070	5.28892
2075	5.10439
2080	5.00616
2085	5.00437
2090	5.03638
2095	5.02712
2100	4.95955