Year	Percent
1950	13.41943
1955	16.24262
1960	18.00815
1965	19.21434
1970	20.96031
1975	21.15374
1980	20.38111
1985	19.60413
1990	21.10661
1995	24.31924
2000	28.43837
2005	33.44965
2010	33.56947
2015	32.41679
2020	29.18505
2025	26.68418
2030	25.67731
2035	25.52054
2040	25.03813
2045	23.34159
2050	22.43662
2055	21.60554
2060	22.26862
2065	24.19932
2070	25.29149
2075	25.4574
2080	24.40404
2085	23.1019
2090	22.17522
2095	22.18626
2100	22.71053