Year	Percent
1950	31.03687
1955	29.35138
1960	24.2957
1965	25.99003
1970	27.10662
1975	30.51292
1980	33.59522
1985	34.54902
1990	35.61533
1995	35.23411
2000	34.64658
2005	33.61344
2010	30.18561
2015	29.15945
2020	30.0314
2025	29.67101
2030	28.91072
2035	27.76399
2040	26.64626
2045	25.95269
2050	25.57278
2055	25.18015
2060	24.63413
2065	23.98268
2070	23.39023
2075	22.95928
2080	22.6526
2085	22.39141
2090	22.11908
2095	21.84163
2100	21.63613