Year	Percent
1950	13.94968
1955	13.77805
1960	13.23926
1965	12.69432
1970	12.11359
1975	11.88057
1980	11.84257
1985	12.07389
1990	13.22052
1995	15.10517
2000	17.3608
2005	19.87184
2010	22.0702
2015	23.11534
2020	24.2181
2025	25.23581
2030	26.00327
2035	27.14756
2040	27.54189
2045	27.53614
2050	27.22428
2055	26.66064
2060	26.22128
2065	25.57655
2070	25.01287
2075	24.56336
2080	24.18715
2085	23.92769
2090	23.72679
2095	23.56354
2100	23.415