Year	Percent
1950	22.97105
1955	20.6255
1960	16.53732
1965	14.99797
1970	15.19302
1975	14.90395
1980	15.22304
1985	13.73201
1990	11.89875
1995	12.57989
2000	14.51017
2005	17.72163
2010	19.95152
2015	21.07933
2020	21.78623
2025	22.99481
2030	25.44219
2035	27.47732
2040	27.91552
2045	26.86289
2050	25.93693
2055	25.5933
2060	26.18718
2065	26.94322
2070	26.51388
2075	25.57178
2080	24.85337
2085	24.69229
2090	24.79607
2095	24.71797
2100	24.32764