Year	Percent
1950	29.63991
1955	28.34714
1960	26.31897
1965	25.39766
1970	26.06665
1975	27.88875
1980	30.51932
1985	32.4395
1990	32.40199
1995	31.15806
2000	29.77517
2005	28.56508
2010	28.7446
2015	28.34095
2020	27.58749
2025	26.35592
2030	25.8701
2035	24.7317
2040	24.43703
2045	24.28297
2050	23.59494
2055	22.99883
2060	22.50674
2065	22.10567
2070	21.8283
2075	21.61191
2080	21.38201
2085	21.10821
2090	20.83861
2095	20.62243
2100	20.45674