Year	Percent
1950	30.1539
1955	28.58821
1960	24.52064
1965	22.82495
1970	20.8139
1975	20.22158
1980	25.63164
1985	28.28567
1990	30.38416
1995	31.50851
2000	30.83857
2005	29.74308
2010	30.2865
2015	31.61221
2020	32.57635
2025	31.70232
2030	29.44738
2035	26.85602
2040	25.40409
2045	24.92048
2050	24.51489
2055	24.1002
2060	22.31969
2065	20.82764
2070	19.89116
2075	19.48564
2080	19.34142
2085	19.06724
2090	18.53756
2095	17.87889
2100	17.37464