Year	Percent
1950	13.71713
1955	13.38984
1960	13.08402
1965	12.76686
1970	12.50863
1975	12.86002
1980	13.41099
1985	13.96669
1990	14.40854
1995	14.88202
2000	15.13824
2005	15.77402
2010	16.66201
2015	17.47714
2020	18.24674
2025	18.80591
2030	19.96782
2035	22.31304
2040	24.89296
2045	26.48731
2050	27.1965
2055	26.72265
2060	26.05587
2065	26.12021
2070	26.12025
2075	25.79949
2080	25.04131
2085	24.26424
2090	23.73332
2095	23.46585
2100	23.33514