Year	Percent
1950	11.6771
1955	12.76044
1960	13.86786
1965	14.77689
1970	12.94888
1975	12.62828
1980	10.42866
1985	8.90296
1990	8.95064
1995	9.42148
2000	8.9274
2005	6.6711
2010	6.66089
2015	6.04202
2020	6.1641
2025	6.15742
2030	5.98594
2035	5.82725
2040	5.66152
2045	5.54142
2050	5.49454
2055	5.48067
2060	5.42947
2065	5.33128
2070	5.2202
2075	5.1323
2080	5.0716
2085	5.03273
2090	4.99448
2095	4.94777
2100	4.89595