Year	Percent
1950	17.53008
1955	19.55946
1960	19.9103
1965	18.00839
1970	16.35946
1975	15.64987
1980	13.86233
1985	13.91556
1990	15.77599
1995	19.82211
2000	23.72639
2005	26.96282
2010	27.78295
2015	27.85501
2020	26.62822
2025	25.32674
2030	24.24473
2035	23.29871
2040	22.88949
2045	22.79639
2050	23.00331
2055	23.14306
2060	23.26263
2065	23.0681
2070	22.87176
2075	22.66819
2080	22.51266
2085	22.41134
2090	22.359
2095	22.32756
2100	22.27607