Year	Percent
1950	3.93192
1955	3.89632
1960	3.93892
1965	3.99023
1970	4.0416
1975	4.09273
1980	4.14733
1985	4.21887
1990	4.52714
1995	4.74865
2000	4.81208
2005	5.18177
2010	5.39336
2015	5.24805
2020	5.48253
2025	5.91233
2030	6.54583
2035	7.25632
2040	8.0596
2045	8.93191
2050	9.77819
2055	10.63353
2060	11.51355
2065	12.3542
2070	13.39509
2075	14.65244
2080	15.82838
2085	16.90592
2090	17.93428
2095	18.99318
2100	20.10426