Year	Percent
1950	12.97514
1955	11.61866
1960	11.99118
1965	13.2433
1970	13.85362
1975	13.78723
1980	13.24213
1985	12.57525
1990	11.92389
1995	11.6243
2000	11.15146
2005	10.70142
2010	9.92069
2015	9.62286
2020	9.20935
2025	8.75149
2030	8.21156
2035	7.71509
2040	7.27243
2045	6.87374
2050	6.50791
2055	6.17795
2060	5.88499
2065	5.63062
2070	5.41939
2075	5.24747
2080	5.10876
2085	4.98727
2090	4.88895
2095	4.80747
2100	4.74493