Year	Percent
1950	20.30645
1955	19.38285
1960	16.51846
1965	14.73723
1970	15.83237
1975	16.24331
1980	17.80056
1985	15.6515
1990	13.92722
1995	13.99075
2000	15.42041
2005	18.36613
2010	19.78014
2015	19.90947
2020	19.60229
2025	19.66777
2030	21.89292
2035	23.32371
2040	23.4801
2045	22.32603
2050	21.31504
2055	22.63915
2060	24.33567
2065	25.92659
2070	25.96104
2075	24.70056
2080	24.2133
2085	24.45422
2090	24.9631
2095	25.14704
2100	24.84928