Year	Percent
1950	4.63588
1955	4.1989
1960	4.13769
1965	4.42512
1970	4.84152
1975	5.22125
1980	5.49862
1985	5.57569
1990	5.87446
1995	5.49022
2000	4.9766
2005	4.59718
2010	4.18703
2015	4.02383
2020	3.87085
2025	3.82591
2030	3.98998
2035	4.35054
2040	4.78418
2045	5.21175
2050	5.60704
2055	6.08715
2060	6.73045
2065	7.66394
2070	8.87352
2075	10.13221
2080	11.4008
2085	12.74234
2090	14.16829
2095	15.64786
2100	17.13399