Year	Percent
1950	12.82315
1955	12.78146
1960	12.46373
1965	9.79434
1970	12.2712
1975	13.16011
1980	12.78613
1985	11.46197
1990	11.3401
1995	13.43498
2000	15.67544
2005	17.41236
2010	20.86639
2015	22.56927
2020	23.05369
2025	23.6085
2030	22.79321
2035	24.76405
2040	27.41377
2045	29.66782
2050	30.29509
2055	28.94854
2060	26.78963
2065	25.1841
2070	24.86704
2075	25.0083
2080	24.92674
2085	24.50824
2090	23.93249
2095	23.33979
2100	23.08609