Year	Percent
1950	16.53742
1955	15.75664
1960	15.10488
1965	13.92534
1970	11.73154
1975	11.19518
1980	10.64407
1985	9.66445
1990	8.56831
1995	8.52367
2000	7.50684
2005	6.92628
2010	6.35807
2015	5.55863
2020	5.25118
2025	5.01316
2030	4.8358
2035	4.61756
2040	4.3833
2045	4.18802
2050	4.06164
2055	4.01218
2060	3.99317
2065	3.96804
2070	3.92967
2075	3.89796
2080	3.89169
2085	3.93225
2090	3.99579
2095	4.05266
2100	4.08542