Year	Percent
1950	14.81523
1955	13.70515
1960	13.10838
1965	12.37417
1970	12.47399
1975	12.27741
1980	14.62082
1985	16.0163
1990	15.90307
1995	16.22049
2000	17.50019
2005	20.20182
2010	22.02127
2015	23.85389
2020	24.22012
2025	23.85173
2030	23.99238
2035	24.19548
2040	25.00597
2045	25.24599
2050	25.46261
2055	25.3916
2060	25.35599
2065	25.40027
2070	25.37379
2075	25.1239
2080	24.81331
2085	24.49245
2090	24.18236
2095	23.93694
2100	23.73046