Year	Percent
1950	29.6047
1955	28.0181
1960	26.92372
1965	25.55632
1970	25.23089
1975	27.42103
1980	29.31724
1985	32.55642
1990	35.19303
1995	35.77614
2000	35.42429
2005	34.05279
2010	33.08571
2015	30.57327
2020	28.54029
2025	26.24738
2030	22.59293
2035	21.47715
2040	21.65047
2045	21.66211
2050	21.24373
2055	20.48647
2060	20.05988
2065	20.16571
2070	20.53601
2075	20.86418
2080	20.96955
2085	20.84466
2090	20.65824
2095	20.56511
2100	20.59199