Year	Percent
1950	29.57706
1955	27.82682
1960	25.58039
1965	25.82725
1970	25.80935
1975	28.01249
1980	31.28733
1985	34.0451
1990	33.09175
1995	29.79831
2000	25.0229
2005	24.10622
2010	22.50894
2015	22.6897
2020	23.37686
2025	23.81714
2030	23.77592
2035	23.40427
2040	23.1442
2045	22.98245
2050	23.15805
2055	22.95863
2060	22.54864
2065	22.17157
2070	21.89258
2075	21.69253
2080	21.52397
2085	21.32899
2090	21.10295
2095	20.89653
2100	20.74371