Year	Percent
1950	16.5371
1955	15.97923
1960	16.34632
1965	16.2974
1970	15.80492
1975	15.63967
1980	17.32816
1985	19.07664
1990	21.28131
1995	24.38541
2000	28.69415
2005	30.8388
2010	32.0883
2015	30.95185
2020	28.47601
2025	25.74983
2030	24.16104
2035	23.55467
2040	23.89523
2045	24.12632
2050	24.11875
2055	23.98435
2060	24.03659
2065	24.05841
2070	24.23579
2075	24.04761
2080	23.63437
2085	23.27177
2090	23.04089
2095	22.8984
2100	22.7706