Year	Percent
1950	19.94769
1955	18.68719
1960	17.06548
1965	16.54622
1970	15.92667
1975	15.19718
1980	14.88521
1985	13.85102
1990	12.13044
1995	14.63698
2000	17.57341
2005	21.5316
2010	25.21197
2015	28.76192
2020	29.15245
2025	28.90447
2030	27.94001
2035	26.29248
2040	23.89265
2045	21.65758
2050	21.34454
2055	22.83381
2060	24.72496
2065	25.85056
2070	25.57921
2075	24.23098
2080	23.55664
2085	23.74315
2090	24.09559
2095	24.04243
2100	23.54033