Year	Percent
1950	2.583
1955	3.06714
1960	3.55019
1965	4.01008
1970	4.39634
1975	4.68192
1980	4.8915
1985	5.02972
1990	5.43296
1995	5.50565
2000	5.49233
2005	5.48862
2010	5.49857
2015	5.50458
2020	5.76316
2025	6.15614
2030	6.66049
2035	7.26357
2040	7.91214
2045	8.57965
2050	9.26069
2055	9.93458
2060	10.62953
2065	11.36435
2070	12.19604
2075	13.15534
2080	14.11669
2085	15.05597
2090	15.97454
2095	16.88635
2100	17.83363