Year	Percent
1950	17.21803
1955	18.34143
1960	19.48679
1965	21.00047
1970	22.64212
1975	23.89291
1980	25.24529
1985	26.52726
1990	28.35044
1995	28.55629
2000	27.8084
2005	26.69217
2010	25.24334
2015	25.97762
2020	26.65566
2025	26.66281
2030	25.61802
2035	23.19683
2040	21.89019
2045	21.04181
2050	20.73964
2055	20.7425
2060	20.62427
2065	20.59276
2070	20.53618
2075	20.51062
2080	20.55129
2085	20.64096
2090	20.69491
2095	20.65395
2100	20.52364