Year	Percent
1950	4.72411
1955	4.78234
1960	4.9166
1965	5.08217
1970	5.04127
1975	4.97358
1980	4.87362
1985	5.13724
1990	6.34395
1995	6.74626
2000	7.12633
2005	7.72176
2010	8.39853
2015	9.58194
2020	10.94485
2025	12.54124
2030	14.56019
2035	17.35361
2040	19.90257
2045	22.22107
2050	24.58278
2055	26.97144
2060	29.31163
2065	31.31597
2070	32.98074
2075	34.58132
2080	35.96391
2085	37.07219
2090	37.89
2095	38.48657
2100	38.93024