Year	Percent
1950	27.48047
1955	27.89424
1960	27.4948
1965	27.35604
1970	28.20597
1975	29.43053
1980	30.96302
1985	31.84583
1990	32.78403
1995	33.02465
2000	32.3408
2005	32.08968
2010	30.82582
2015	29.21267
2020	27.11111
2025	26.26816
2030	26.4985
2035	26.3569
2040	25.92422
2045	24.74991
2050	23.28258
2055	22.47693
2060	22.13282
2065	21.97901
2070	21.66915
2075	21.04788
2080	20.30446
2085	19.77801
2090	19.61657
2095	19.67592
2100	19.71714