Year	Percent
1950	18.42859
1955	19.23536
1960	18.69705
1965	18.53757
1970	18.72002
1975	19.11305
1980	19.48145
1985	20.13566
1990	21.05219
1995	22.33476
2000	23.8142
2005	24.95295
2010	24.82826
2015	24.79696
2020	26.02119
2025	27.18917
2030	28.10372
2035	28.59969
2040	28.42929
2045	27.75012
2050	26.8097
2055	25.95586
2060	25.0701
2065	24.213
2070	23.49798
2075	22.93233
2080	22.64807
2085	22.66043
2090	22.70321
2095	22.63616
2100	22.43942