Year	Percent
1950	5.01948
1955	5.04249
1960	4.9595
1965	4.78434
1970	4.51549
1975	4.22661
1980	3.80744
1985	3.7694
1990	4.1923
1995	4.03445
2000	4.61968
2005	4.52726
2010	4.63686
2015	5.11611
2020	5.68993
2025	6.51515
2030	6.83957
2035	7.55061
2040	8.67569
2045	10.64563
2050	12.52098
2055	13.79117
2060	15.33135
2065	17.12681
2070	19.2231
2075	21.28436
2080	23.19112
2085	24.91966
2090	26.60011
2095	28.30768
2100	29.98853