Year	Percent
1950	14.04177
1955	14.03541
1960	13.97522
1965	14.73472
1970	13.7679
1975	14.1717
1980	14.35067
1985	12.10649
1990	9.92446
1995	8.48004
2000	8.11486
2005	9.17188
2010	10.64578
2015	11.8076
2020	13.93591
2025	14.49818
2030	15.55667
2035	16.01632
2040	16.0618
2045	17.4184
2050	18.46158
2055	19.75688
2060	20.66177
2065	21.11873
2070	21.52635
2075	21.99166
2080	22.545
2085	23.06797
2090	23.48553
2095	23.81431
2100	24.08799