Year	Percent
1950	18.80167
1955	17.18867
1960	17.95759
1965	18.6034
1970	18.7978
1975	18.3934
1980	17.91165
1985	17.43614
1990	16.86964
1995	16.23386
2000	15.88029
2005	15.38853
2010	15.2485
2015	14.95989
2020	13.93948
2025	13.00055
2030	12.28257
2035	11.77295
2040	11.32725
2045	10.90106
2050	10.41355
2055	9.89017
2060	9.42515
2065	9.04624
2070	8.70466
2075	8.37265
2080	8.03891
2085	7.7164
2090	7.40737
2095	7.14122
2100	6.91498