Year	Percent
1950	19.18317
1955	18.82783
1960	16.31359
1965	14.32955
1970	14.46451
1975	14.16799
1980	14.73418
1985	13.10958
1990	11.96428
1995	12.83257
2000	14.7579
2005	17.52601
2010	19.48367
2015	19.9873
2020	20.44839
2025	21.24921
2030	23.12341
2035	24.77851
2040	24.46171
2045	23.90586
2050	23.03523
2055	23.95772
2060	25.74623
2065	26.84906
2070	27.15575
2075	26.03454
2080	25.49583
2085	25.69896
2090	26.22215
2095	26.44552
2100	26.12553