Year	Percent
1950	11.79086
1955	13.09663
1960	15.0716
1965	16.47137
1970	15.82625
1975	15.77672
1980	15.56316
1985	14.28967
1990	14.72846
1995	14.09234
2000	13.79421
2005	13.51408
2010	12.29517
2015	10.76793
2020	10.11355
2025	9.83756
2030	9.39627
2035	8.77096
2040	8.13353
2045	7.61842
2050	7.25078
2055	6.9767
2060	6.71421
2065	6.4566
2070	6.20831
2075	6.00927
2080	5.86453
2085	5.75315
2090	5.65866
2095	5.55826
2100	5.4565