Year	Percent
1950	27.21588
1955	24.74354
1960	26.74958
1965	26.75228
1970	30.07181
1975	32.3373
1980	32.34656
1985	32.31665
1990	29.18441
1995	27.52057
2000	27.09183
2005	26.47109
2010	27.35165
2015	27.73231
2020	26.40389
2025	24.30644
2030	22.13475
2035	20.6436
2040	20.34375
2045	20.77629
2050	21.19236
2055	20.95211
2060	20.36286
2065	19.78519
2070	19.58353
2075	19.84049
2080	20.28927
2085	20.56168
2090	20.49523
2095	20.20139
2100	19.91973