Year	Percent
1950	12.05404
1955	11.5365
1960	10.31929
1965	13.33806
1970	13.82086
1975	12.80201
1980	12.52522
1985	12.89846
1990	13.08674
1995	13.19837
2000	12.59483
2005	11.60733
2010	10.49601
2015	9.48195
2020	8.95762
2025	8.29239
2030	7.70356
2035	7.07423
2040	6.53188
2045	6.08298
2050	5.73489
2055	5.44559
2060	5.19671
2065	4.9879
2070	4.80702
2075	4.67884
2080	4.58554
2085	4.51687
2090	4.47357
2095	4.43493
2100	4.40498