Year	Percent
1950	31.07209
1955	29.97167
1960	29.32322
1965	28.65909
1970	27.69513
1975	28.51917
1980	28.65567
1985	28.22597
1990	27.79137
1995	28.74917
2000	28.10083
2005	27.35215
2010	27.0245
2015	28.5373
2020	31.84334
2025	34.9922
2030	36.53766
2035	35.95007
2040	33.7601
2045	31.30289
2050	29.37978
2055	28.06413
2060	26.46231
2065	24.82897
2070	23.44784
2075	22.49891
2080	21.88231
2085	21.40353
2090	20.98678
2095	20.64078
2100	20.40092