Year	Percent
1950	35.1477
1955	35.1402
1960	35.11769
1965	29.26734
1970	21.40504
1975	21.6696
1980	21.88338
1985	23.36317
1990	24.68517
1995	25.51493
2000	28.20013
2005	27.99504
2010	29.12557
2015	29.14715
2020	28.24754
2025	29.45366
2030	30.00386
2035	30.94565
2040	31.29472
2045	30.97368
2050	30.59089
2055	30.30897
2060	30.17121
2065	29.99048
2070	29.66091
2075	29.22706
2080	28.75732
2085	28.30151
2090	27.8946
2095	27.51911
2100	27.14512