Year	Percent
1950	18.54305
1955	19.33459
1960	19.51087
1965	17.67003
1970	15.16924
1975	14.2496
1980	14.70379
1985	14.91837
1990	13.88287
1995	12.96728
2000	12.26464
2005	10.9844
2010	10.52807
2015	9.97712
2020	9.19937
2025	8.60638
2030	8.24395
2035	7.97997
2040	7.66938
2045	7.33737
2050	7.01137
2055	6.70279
2060	6.435
2065	6.21448
2070	6.04344
2075	5.88504
2080	5.71817
2085	5.56556
2090	5.42518
2095	5.31178
2100	5.22253