Year	Percent
1950	4.50421
1955	5.92312
1960	7.28682
1965	6.70567
1970	6.64433
1975	8.08516
1980	10.24114
1985	9.36452
1990	9.57507
1995	9.86372
2000	9.66473
2005	9.63385
2010	10.96004
2015	14.44715
2020	18.79808
2025	23.27294
2030	26.16114
2035	28.80592
2040	30.21496
2045	33.19303
2050	36.24265
2055	37.41807
2060	37.0856
2065	35.71365
2070	34.73683
2075	34.64456
2080	35.09292
2085	35.4422
2090	35.62673
2095	35.76705
2100	36.04685