Year	Percent
1950	27.68246
1955	27.16284
1960	26.05888
1965	26.53406
1970	28.17576
1975	29.68722
1980	30.71034
1985	32.27576
1990	32.06657
1995	31.81504
2000	30.66691
2005	31.52478
2010	32.00988
2015	31.54641
2020	30.43253
2025	29.26055
2030	29.44819
2035	29.51378
2040	29.65407
2045	29.36601
2050	28.3419
2055	27.43102
2060	26.8324
2065	26.39407
2070	25.90833
2075	25.29143
2080	24.62962
2085	24.00406
2090	23.4865
2095	23.08871
2100	22.76745