Year	Percent
1950	3.74503
1955	3.77891
1960	3.83473
1965	4.00107
1970	4.06411
1975	4.71725
1980	5.20051
1985	5.91287
1990	6.99297
1995	7.74543
2000	8.13156
2005	9.06643
2010	11.13639
2015	14.31691
2020	17.31843
2025	20.51474
2030	23.55395
2035	25.37978
2040	26.3793
2045	26.45559
2050	26.37239
2055	26.824
2060	28.07103
2065	29.86004
2070	31.46694
2075	33.11645
2080	34.44842
2085	35.58555
2090	36.58021
2095	37.41541
2100	38.0638