Year	Percent
1950	17.32021
1955	18.34507
1960	18.7156
1965	17.55202
1970	16.65439
1975	16.2696
1980	17.15841
1985	18.19929
1990	19.06231
1995	20.87757
2000	22.2054
2005	26.39082
2010	30.35143
2015	32.51821
2020	31.98583
2025	28.75369
2030	26.68845
2035	24.54656
2040	24.73957
2045	24.43496
2050	22.75933
2055	22.2934
2060	22.15188
2065	22.52552
2070	22.94803
2075	22.64654
2080	22.23996
2085	21.94251
2090	21.89585
2095	21.97447
2100	22.0057