Year	Percent
1950	20.09445
1955	21.27869
1960	21.61755
1965	22.13409
1970	23.50779
1975	24.01389
1980	25.10729
1985	24.82496
1990	24.26935
1995	23.92212
2000	24.80914
2005	26.3628
2010	27.60543
2015	29.44598
2020	30.46547
2025	30.76887
2030	28.97454
2035	26.81983
2040	24.65519
2045	23.20051
2050	23.63799
2055	23.92013
2060	23.62245
2065	22.96335
2070	21.7869
2075	21.34355
2080	21.59147
2085	22.11756
2090	22.39326
2095	22.27138
2100	21.85739