Year	Percent
1950	27.10773
1955	26.18664
1960	24.14188
1965	23.53347
1970	21.85005
1975	22.36057
1980	26.52902
1985	30.9732
1990	33.45349
1995	34.24293
2000	33.51837
2005	31.67612
2010	31.0761
2015	30.66553
2020	31.10147
2025	31.09994
2030	30.78471
2035	30.34536
2040	29.78544
2045	29.28439
2050	28.69621
2055	27.90378
2060	27.09607
2065	26.36442
2070	25.74736
2075	25.24078
2080	24.80731
2085	24.40794
2090	24.02033
2095	23.64062
2100	23.30359