Year	Percent
1950	5.00381
1955	5.12731
1960	5.36214
1965	5.38683
1970	5.50871
1975	5.69095
1980	5.77275
1985	6.019
1990	7.10735
1995	7.6494
2000	8.58837
2005	9.61437
2010	11.08713
2015	13.0746
2020	15.3514
2025	18.01383
2030	20.63891
2035	23.20164
2040	26.07749
2045	29.18306
2050	31.85758
2055	34.15288
2060	36.32573
2065	37.95733
2070	39.01685
2075	39.90731
2080	40.55232
2085	40.95575
2090	41.18877
2095	41.3248
2100	41.40005