Year	Percent
1950	28.29932
1955	25.9409
1960	25.29269
1965	21.99833
1970	23.47693
1975	21.31783
1980	27.62183
1985	30.39742
1990	32.89738
1995	31.48475
2000	30.19154
2005	24.42494
2010	21.68062
2015	19.06222
2020	20.27103
2025	22.10171
2030	24.11476
2035	25.11234
2040	24.56269
2045	23.51049
2050	22.3677
2055	22.91359
2060	23.16096
2065	23.26334
2070	22.83873
2075	22.02589
2080	21.21235
2085	20.81485
2090	20.84243
2095	20.96087
2100	20.9389