Year	Percent
1950	3.92585
1955	3.61346
1960	3.48086
1965	3.47108
1970	3.5201
1975	3.62224
1980	3.64064
1985	3.94934
1990	4.27512
1995	4.55855
2000	4.46295
2005	4.639
2010	4.968
2015	5.60132
2020	6.06027
2025	7.41821
2030	8.63722
2035	9.74895
2040	9.6961
2045	13.48663
2050	15.03167
2055	17.71715
2060	19.57136
2065	20.63695
2070	22.14638
2075	23.81025
2080	25.49065
2085	26.94898
2090	28.22502
2095	29.48242
2100	30.74785