Year	Percent
1950	5.40337
1955	5.92442
1960	5.87715
1965	5.69772
1970	5.87443
1975	6.29863
1980	6.78955
1985	7.6977
1990	9.70969
1995	11.31208
2000	13.02896
2005	14.90638
2010	17.4086
2015	20.60454
2020	25.32776
2025	29.9237
2030	34.28366
2035	38.08259
2040	40.8425
2045	43.30013
2050	44.35823
2055	45.73709
2060	46.36854
2065	45.77083
2070	44.91524
2075	44.18631
2080	43.78985
2085	43.63298
2090	43.73815
2095	43.73008
2100	43.51021