Year	Percent
1950	4.34474
1955	4.26994
1960	4.45369
1965	2.55507
1970	3.86068
1975	3.50863
1980	3.49053
1985	3.6738
1990	3.71483
1995	3.86465
2000	3.83561
2005	3.43726
2010	3.54608
2015	4.12872
2020	5.35751
2025	7.1578
2030	9.20783
2035	11.62204
2040	14.26864
2045	15.90801
2050	17.38922
2055	19.55193
2060	23.0868
2065	26.66893
2070	29.69137
2075	32.66864
2080	34.97939
2085	36.20142
2090	36.7162
2095	37.04722
2100	37.06204