Year	Percent
1950	15.77808
1955	18.43452
1960	18.48475
1965	18.699
1970	18.2263
1975	18.21894
1980	17.99575
1985	17.06264
1990	15.27058
1995	12.81335
2000	9.82153
2005	8.81983
2010	10.56881
2015	11.56386
2020	10.01289
2025	8.57258
2030	7.45558
2035	6.89573
2040	6.80546
2045	6.8602
2050	6.73818
2055	6.31083
2060	5.80059
2065	5.47461
2070	5.37401
2075	5.39699
2080	5.39628
2085	5.28831
2090	5.09758
2095	4.92048
2100	4.82787