Year	Percent
1950	27.87525
1955	28.32022
1960	27.75176
1965	27.4314
1970	28.09936
1975	29.20899
1980	30.71083
1985	31.65078
1990	32.63906
1995	33.01153
2000	32.22052
2005	32.07439
2010	30.95614
2015	28.91288
2020	26.80512
2025	26.24915
2030	26.90144
2035	27.0511
2040	26.76557
2045	25.70744
2050	24.28526
2055	23.49201
2060	23.14147
2065	22.97442
2070	22.62204
2075	21.92023
2080	21.08893
2085	20.50521
2090	20.32806
2095	20.39564
2100	20.4454