Year	Percent
1950	3.38524
1955	3.24444
1960	3.08415
1965	3.15511
1970	3.22607
1975	3.91217
1980	4.60492
1985	5.46597
1990	7.04746
1995	7.63216
2000	8.8002
2005	9.87921
2010	11.97205
2015	14.16972
2020	16.33219
2025	18.89341
2030	21.00894
2035	22.80183
2040	23.83249
2045	24.78046
2050	26.22008
2055	28.01558
2060	29.77002
2065	31.56012
2070	32.98604
2075	34.32077
2080	35.64748
2085	36.96134
2090	38.13243
2095	39.09524
2100	39.86734