Year	Percent
1950	11.67569
1955	16.0738
1960	17.96595
1965	18.28485
1970	15.03016
1975	12.41736
1980	11.33597
1985	12.0016
1990	12.95901
1995	11.50264
2000	8.7722
2005	7.5322
2010	7.77474
2015	9.0086
2020	7.92196
2025	6.70453
2030	6.0224
2035	5.92439
2040	5.95446
2045	5.83762
2050	5.59753
2055	5.34636
2060	5.18543
2065	5.15577
2070	5.18141
2075	5.18031
2080	5.13047
2085	5.05149
2090	4.98055
2095	4.9468
2100	4.94901