Year	Percent
1950	15.32082
1955	16.81323
1960	16.89988
1965	16.92112
1970	16.95559
1975	17.06614
1980	16.98401
1985	16.4112
1990	15.40858
1995	15.04748
2000	15.16542
2005	14.58162
2010	13.83136
2015	12.93607
2020	12.28889
2025	11.75282
2030	11.24644
2035	10.75447
2040	10.26011
2045	9.79398
2050	9.35488
2055	8.97538
2060	8.6238
2065	8.28826
2070	7.97082
2075	7.65806
2080	7.37304
2085	7.10745
2090	6.86348
2095	6.64602
2100	6.44423