Year	Percent
1950	28.8148
1955	28.69905
1960	27.5496
1965	25.59987
1970	25.49079
1975	27.4243
1980	32.95458
1985	34.25124
1990	38.42129
1995	39.0305
2000	40.6731
2005	38.79795
2010	37.41642
2015	35.35412
2020	33.17621
2025	30.75797
2030	28.16278
2035	26.87836
2040	25.76164
2045	24.8625
2050	24.35826
2055	23.42345
2060	22.5573
2065	21.96841
2070	21.6853
2075	21.56429
2080	21.4683
2085	21.27335
2090	20.98357
2095	20.72519
2100	20.57822