Year	Percent
1950	10.16545
1955	9.45419
1960	10.26393
1965	11.78767
1970	13.59367
1975	14.39241
1980	13.42759
1985	13.84514
1990	17.43499
1995	20.08665
2000	21.76022
2005	21.92176
2010	23.79375
2015	25.84209
2020	28.04523
2025	30.00204
2030	31.2113
2035	32.72283
2040	34.28667
2045	35.81451
2050	37.05053
2055	37.55454
2060	38.25908
2065	38.18531
2070	38.72056
2075	39.0575
2080	39.07888
2085	38.95612
2090	38.8524
2095	38.80698
2100	38.87415