Year	Percent
1950	5.27438
1955	4.67252
1960	4.22758
1965	3.99944
1970	3.92026
1975	3.93094
1980	4.00604
1985	4.09602
1990	4.34341
1995	4.46954
2000	4.63273
2005	4.81759
2010	4.92722
2015	4.79509
2020	4.83729
2025	5.00903
2030	5.2876
2035	5.62146
2040	6.01222
2045	6.45403
2050	7.10177
2055	7.89748
2060	8.79484
2065	9.68339
2070	10.60796
2075	11.56143
2080	12.56264
2085	13.6008
2090	14.63441
2095	15.65429
2100	16.6838