Year	Percent
1950	4.66189
1955	4.72435
1960	4.79381
1965	5.12313
1970	5.54846
1975	5.42801
1980	5.09961
1985	4.93219
1990	5.05953
1995	4.86075
2000	4.51742
2005	4.20262
2010	4.073
2015	4.34103
2020	4.66548
2025	5.02038
2030	5.43557
2035	5.93586
2040	6.51402
2045	7.10758
2050	7.78263
2055	8.64408
2060	9.71224
2065	10.79162
2070	11.85605
2075	12.91338
2080	14.08173
2085	15.34868
2090	16.67019
2095	17.99673
2100	19.34744