Year	Percent
1950	8.99327
1955	7.87575
1960	8.6308
1965	7.7079
1970	7.71249
1975	8.23401
1980	8.0918
1985	7.54051
1990	6.23401
1995	5.31132
2000	4.94136
2005	4.78714
2010	4.64525
2015	4.71222
2020	4.76534
2025	4.3968
2030	4.22382
2035	4.15676
2040	4.21278
2045	4.3344
2050	4.44962
2055	4.50466
2060	4.50599
2065	4.51151
2070	4.55796
2075	4.62981
2080	4.68656
2085	4.70718
2090	4.68839
2095	4.64557
2100	4.61541