Year	Percent
1950	5.79129
1955	5.44254
1960	5.2107
1965	5.05589
1970	4.97489
1975	5.03222
1980	5.29656
1985	5.73745
1990	6.93419
1995	7.68092
2000	8.59297
2005	9.57692
2010	10.64013
2015	11.98202
2020	13.39677
2025	15.00885
2030	16.76523
2035	18.73459
2040	20.84743
2045	22.95444
2050	25.47571
2055	28.81677
2060	32.20624
2065	34.52261
2070	36.38805
2075	38.03451
2080	39.67301
2085	41.04904
2090	42.03459
2095	42.6738
2100	43.11105