Year	Percent
1950	14.96172
1955	17.90364
1960	17.89627
1965	17.52002
1970	16.95171
1975	16.68108
1980	17.8063
1985	18.97364
1990	16.56235
1995	12.5204
2000	9.64883
2005	7.83048
2010	8.57015
2015	8.60096
2020	7.33059
2025	5.91775
2030	4.94167
2035	4.67108
2040	4.84198
2045	4.97987
2050	4.78383
2055	4.37511
2060	4.03588
2065	3.95552
2070	4.1143
2075	4.3389
2080	4.43936
2085	4.37483
2090	4.24291
2095	4.18822
2100	4.25846