Year	Percent
1950	12.82069
1955	12.75205
1960	12.77646
1965	12.85405
1970	13.59098
1975	15.0082
1980	15.35015
1985	16.48316
1990	18.45838
1995	20.19462
2000	22.40055
2005	25.83251
2010	27.13883
2015	27.21352
2020	27.75049
2025	26.60469
2030	26.41799
2035	27.75473
2040	27.52176
2045	28.41464
2050	28.25112
2055	26.18664
2060	24.55685
2065	22.94125
2070	22.46504
2075	22.81189
2080	23.08057
2085	22.95461
2090	22.51564
2095	22.14097
2100	22.05819