Year	Percent
1950	11.93611
1955	12.25219
1960	12.17116
1965	11.06463
1970	11.64232
1975	11.85745
1980	12.04193
1985	11.96733
1990	12.21401
1995	14.26816
2000	14.66426
2005	12.37993
2010	11.32412
2015	12.22254
2020	12.66451
2025	11.93016
2030	11.16431
2035	10.4904
2040	10.05992
2045	9.80224
2050	9.49797
2055	9.06616
2060	8.57317
2065	8.13766
2070	7.80049
2075	7.52753
2080	7.25732
2085	6.94507
2090	6.63824
2095	6.36984
2100	6.14336