Year	Percent
1950	17.91005
1955	16.04749
1960	16.87974
1965	17.504
1970	17.98904
1975	17.77603
1980	17.32927
1985	16.99254
1990	16.94689
1995	15.96835
2000	13.51201
2005	10.77596
2010	9.67678
2015	8.58564
2020	8.09346
2025	7.38562
2030	6.67031
2035	6.07902
2040	5.67851
2045	5.43146
2050	5.26168
2055	5.09546
2060	4.9239
2065	4.77965
2070	4.70168
2075	4.6891
2080	4.70932
2085	4.72102
2090	4.70523
2095	4.6763
2100	4.66029