Year	Percent
1950	24.49451
1955	26.4855
1960	27.96341
1965	27.78202
1970	27.28743
1975	25.60192
1980	22.86778
1985	24.33525
1990	25.53869
1995	30.84683
2000	31.80553
2005	32.71073
2010	32.2148
2015	31.63384
2020	31.51152
2025	31.00508
2030	30.88475
2035	31.10558
2040	30.89385
2045	30.43028
2050	29.61992
2055	28.66646
2060	28.02008
2065	27.4943
2070	26.93949
2075	26.22666
2080	25.38751
2085	24.5519
2090	23.8493
2095	23.31819
2100	22.87828