Year	Percent
1950	15.42158
1955	14.96727
1960	13.51357
1965	13.4526
1970	12.06372
1975	11.02891
1980	9.74786
1985	9.95522
1990	8.97139
1995	9.58278
2000	9.86805
2005	10.44473
2010	11.49902
2015	11.84679
2020	12.60099
2025	13.2371
2030	13.69472
2035	14.43191
2040	15.22884
2045	16.33595
2050	17.72662
2055	19.24808
2060	20.64322
2065	21.86826
2070	22.92822
2075	23.80504
2080	24.54817
2085	25.12522
2090	25.51605
2095	25.74066
2100	25.84802