Year	Percent
1950	16.17168
1955	21.05598
1960	19.77652
1965	18.58284
1970	17.9998
1975	18.23667
1980	17.03313
1985	17.40617
1990	16.27437
1995	15.32219
2000	15.1097
2005	13.59699
2010	11.9769
2015	11.15708
2020	10.74653
2025	10.14043
2030	9.36416
2035	8.60032
2040	7.99469
2045	7.55831
2050	7.22597
2055	6.90996
2060	6.60377
2065	6.31521
2070	6.08376
2075	5.91414
2080	5.78451
2085	5.67729
2090	5.56624
2095	5.45455
2100	5.35558