Year	Percent
1950	30.7471
1955	28.03897
1960	25.78386
1965	24.83249
1970	25.96312
1975	28.98235
1980	31.88385
1985	33.82106
1990	33.05304
1995	31.14522
2000	28.94816
2005	27.3174
2010	26.65091
2015	27.12396
2020	27.23657
2025	26.91804
2030	26.30342
2035	25.2099
2040	24.71086
2045	24.52757
2050	24.3823
2055	24.45296
2060	24.25106
2065	23.85065
2070	23.45691
2075	23.20671
2080	23.08529
2085	23.00832
2090	22.88587
2095	22.67116
2100	22.42466