Year	Percent
1950	15.71406
1955	15.67414
1960	15.99027
1965	15.42288
1970	15.71834
1975	15.71907
1980	16.4112
1985	17.32595
1990	18.19953
1995	20.62208
2000	22.94829
2005	26.07223
2010	28.87948
2015	29.80409
2020	27.86451
2025	23.86843
2030	20.06128
2035	18.76656
2040	20.42835
2045	22.84526
2050	25.12944
2055	25.00815
2060	23.31528
2065	22.04665
2070	21.81027
2075	22.01185
2080	22.51643
2085	22.49074
2090	21.79085
2095	20.99325
2100	20.64271