Year	Percent
1950	28.9268
1955	29.50577
1960	29.71792
1965	28.90931
1970	27.21796
1975	26.5733
1980	27.31903
1985	28.97903
1990	31.43194
1995	33.34571
2000	34.42507
2005	33.97496
2010	33.54791
2015	32.42476
2020	31.39421
2025	30.59874
2030	30.04987
2035	29.87181
2040	29.51134
2045	28.80291
2050	28.14454
2055	27.29893
2060	26.70798
2065	26.25904
2070	25.83879
2075	25.37153
2080	24.87775
2085	24.42689
2090	24.06548
2095	23.78403
2100	23.54383