Year	Percent
1950	18.77586
1955	18.14546
1960	17.07464
1965	15.57651
1970	13.97348
1975	12.69012
1980	11.88413
1985	11.61583
1990	11.21694
1995	11.37415
2000	11.54645
2005	11.83232
2010	12.32538
2015	12.68634
2020	13.13012
2025	13.63739
2030	14.25802
2035	15.06529
2040	15.94763
2045	16.83829
2050	17.76228
2055	18.62814
2060	19.39919
2065	20.11555
2070	20.74942
2075	21.32176
2080	21.8743
2085	22.37434
2090	22.82159
2095	23.23812
2100	23.62291