Year	Percent
1950	27.15255
1955	26.93266
1960	26.55088
1965	26.44805
1970	27.41882
1975	29.24112
1980	32.10395
1985	34.31886
1990	36.03827
1995	36.37525
2000	34.61331
2005	32.28856
2010	30.77494
2015	30.77469
2020	29.75922
2025	30.13184
2030	29.48446
2035	26.9944
2040	25.13363
2045	23.30859
2050	22.69576
2055	22.88015
2060	22.92337
2065	22.5559
2070	21.90796
2075	21.39326
2080	21.26467
2085	21.47313
2090	21.74169
2095	21.80462
2100	21.62794