Year	Percent
1950	29.27149
1955	29.9507
1960	27.38756
1965	26.08336
1970	24.00229
1975	22.69146
1980	25.48767
1985	25.5201
1990	25.03763
1995	25.6104
2000	25.84852
2005	27.89278
2010	30.2181
2015	29.74931
2020	28.12373
2025	26.31511
2030	25.11118
2035	25.22202
2040	25.3569
2045	24.60057
2050	23.27518
2055	22.62114
2060	22.51623
2065	22.87843
2070	23.26373
2075	23.29069
2080	22.97812
2085	22.52775
2090	22.22147
2095	22.15176
2100	22.20833