Year	Percent
1950	19.07443
1955	19.23009
1960	18.92359
1965	18.23465
1970	17.00467
1975	16.56789
1980	16.96384
1985	17.97772
1990	18.69813
1995	19.3439
2000	20.44478
2005	21.88701
2010	24.77205
2015	26.57725
2020	26.33133
2025	25.06835
2030	24.54734
2035	24.61563
2040	25.33441
2045	26.08254
2050	25.95541
2055	25.41087
2060	25.13892
2065	25.04908
2070	25.04387
2075	24.76244
2080	24.40362
2085	24.04677
2090	23.73814
2095	23.50344
2100	23.33501