Year	Percent
1950	12.52018
1955	13.30978
1960	13.9362
1965	12.55005
1970	12.75945
1975	11.57861
1980	11.09012
1985	10.60344
1990	10.1147
1995	9.09789
2000	8.51379
2005	8.34733
2010	8.05845
2015	7.44876
2020	6.81397
2025	5.94013
2030	5.62106
2035	5.39455
2040	5.24887
2045	5.05797
2050	4.84101
2055	4.65404
2060	4.53572
2065	4.50341
2070	4.507
2075	4.50445
2080	4.48427
2085	4.46554
2090	4.46545
2095	4.50671
2100	4.55969