Year	Percent
1950	12.53552
1955	11.37427
1960	11.46101
1965	11.73891
1970	12.26874
1975	12.74358
1980	13.19182
1985	12.34198
1990	10.95088
1995	9.7511
2000	8.67196
2005	7.97451
2010	7.20896
2015	6.71645
2020	6.25753
2025	5.81847
2030	5.19125
2035	4.91177
2040	4.90365
2045	4.89799
2050	4.82834
2055	4.75308
2060	4.67379
2065	4.62074
2070	4.63317
2075	4.69283
2080	4.7359
2085	4.75121
2090	4.74538
2095	4.74987
2100	4.77095