Year	Percent
1950	11.4768
1955	10.00113
1960	8.62651
1965	8.4279
1970	10.44284
1975	11.70164
1980	12.08299
1985	11.45117
1990	10.83516
1995	10.88989
2000	11.33576
2005	10.45024
2010	9.83031
2015	8.50014
2020	8.03206
2025	7.88652
2030	8.23875
2035	7.70669
2040	7.14112
2045	6.64436
2050	6.29898
2055	6.10515
2060	5.97508
2065	5.81593
2070	5.60691
2075	5.39378
2080	5.2284
2085	5.12888
2090	5.07373
2095	5.02488
2100	4.95263