Year	Percent
1950	4.99009
1955	4.05636
1960	6.11255
1965	6.30101
1970	6.45161
1975	6.82069
1980	7.08383
1985	7.32332
1990	10.02497
1995	10.3486
2000	10.08544
2005	9.78536
2010	12.05644
2015	13.09436
2020	15.02845
2025	17.8596
2030	20.87472
2035	23.66292
2040	26.39523
2045	29.36275
2050	32.00643
2055	35.58954
2060	38.65999
2065	40.4332
2070	41.08128
2075	41.59707
2080	41.94993
2085	42.06239
2090	41.98902
2095	41.75463
2100	41.46122