Year	Percent
1950	28.25671
1955	28.80707
1960	28.5136
1965	27.75289
1970	26.80592
1975	25.70464
1980	24.88117
1985	25.90186
1990	27.97659
1995	30.31939
2000	32.2191
2005	33.35447
2010	34.17644
2015	34.71697
2020	34.46598
2025	33.6653
2030	32.36553
2035	30.96755
2040	29.44471
2045	27.82956
2050	26.458
2055	25.16842
2060	23.90565
2065	22.80371
2070	21.9141
2075	21.24361
2080	20.75573
2085	20.37813
2090	20.09272
2095	19.88803
2100	19.75199