Year	Percent
1950	13.83518
1955	12.86717
1960	14.93599
1965	15.58556
1970	16.33544
1975	16.12732
1980	15.82385
1985	14.17959
1990	14.3441
1995	12.97621
2000	10.22308
2005	10.86478
2010	8.36333
2015	8.04241
2020	8.31613
2025	8.06485
2030	7.08239
2035	6.51704
2040	6.32144
2045	6.25838
2050	6.25304
2055	6.17087
2060	5.98918
2065	5.80523
2070	5.71278
2075	5.69653
2080	5.69435
2085	5.65204
2090	5.56525
2095	5.46495
2100	5.39245