Year	Percent
1950	14.30861
1955	15.83341
1960	16.39151
1965	16.07043
1970	15.62569
1975	16.58836
1980	18.13265
1985	19.64903
1990	22.75499
1995	24.97137
2000	27.43993
2005	30.86743
2010	32.23106
2015	31.7507
2020	29.57402
2025	25.91013
2030	23.2142
2035	23.22701
2040	24.28044
2045	25.91436
2050	27.55852
2055	26.30353
2060	24.84526
2065	23.92717
2070	23.64398
2075	24.34037
2080	24.66717
2085	24.39731
2090	23.703
2095	23.12184
2100	22.97233