Year	Percent
1950	14.92353
1955	13.56036
1960	12.67754
1965	12.59583
1970	12.46749
1975	12.02234
1980	11.03882
1985	9.9464
1990	9.52723
1995	10.30643
2000	11.4531
2005	13.04515
2010	14.28828
2015	15.00866
2020	16.06693
2025	18.09641
2030	19.76058
2035	20.64604
2040	22.09223
2045	23.63458
2050	25.38559
2055	26.9257
2060	27.05777
2065	26.62005
2070	26.02455
2075	25.68044
2080	25.79386
2085	25.8146
2090	25.59394
2095	25.13673
2100	24.59816