Year	Percent
1950	8.48083
1955	8.80085
1960	9.96929
1965	11.65851
1970	13.38194
1975	14.41186
1980	13.48311
1985	13.85867
1990	17.3854
1995	18.41679
2000	19.36818
2005	20.00409
2010	22.4401
2015	25.74925
2020	29.02439
2025	30.81395
2030	32.17304
2035	34.23746
2040	37.06888
2045	40.24858
2050	42.47915
2055	44.01864
2060	44.4239
2065	44.16918
2070	44.54572
2075	44.5864
2080	44.15881
2085	43.47729
2090	42.84001
2095	42.36197
2100	42.18814