Year	Percent
1950	5.04949
1955	4.89682
1960	5.40709
1965	5.72471
1970	6.02494
1975	6.52509
1980	6.01379
1985	6.01717
1990	7.26502
1995	8.28287
2000	8.95578
2005	9.55611
2010	10.35777
2015	11.47742
2020	12.90613
2025	14.90707
2030	17.01024
2035	19.3623
2040	21.9143
2045	24.42277
2050	26.59116
2055	28.47952
2060	30.40983
2065	32.07784
2070	33.50781
2075	34.83733
2080	35.95363
2085	36.84444
2090	37.53093
2095	38.10935
2100	38.59649