Year	Percent
1950	15.29226
1955	16.37565
1960	16.48634
1965	16.65726
1970	16.97634
1975	17.89849
1980	18.07425
1985	17.04655
1990	16.09343
1995	15.57418
2000	14.21986
2005	13.30751
2010	13.02147
2015	13.35067
2020	12.60422
2025	11.77949
2030	10.97051
2035	10.29322
2040	9.7533
2045	9.28542
2050	8.79268
2055	8.26086
2060	7.74924
2065	7.30792
2070	6.9432
2075	6.63982
2080	6.37436
2085	6.11527
2090	5.88205
2095	5.68599
2100	5.52592