Year	Percent
1950	17.63695
1955	17.24229
1960	17.10166
1965	16.74251
1970	16.47798
1975	15.91813
1980	14.85418
1985	13.8864
1990	13.74244
1995	15.36404
2000	17.27599
2005	19.31571
2010	21.51475
2015	22.76092
2020	23.76243
2025	24.50827
2030	24.93888
2035	25.38525
2040	26.09393
2045	27.26899
2050	27.85322
2055	27.73244
2060	27.24718
2065	26.43595
2070	26.17987
2075	26.31638
2080	26.33504
2085	26.09703
2090	25.67481
2095	25.27193
2100	25.0039