Year	Percent
1950	4.75481
1955	4.31477
1960	4.14145
1965	4.05934
1970	4.06633
1975	4.17986
1980	4.37834
1985	4.64401
1990	5.07507
1995	5.22078
2000	5.32818
2005	5.20626
2010	5.0898
2015	5.21993
2020	5.45259
2025	5.75029
2030	6.12933
2035	6.65317
2040	7.30159
2045	8.05989
2050	8.80181
2055	9.56372
2060	10.61564
2065	11.89611
2070	13.22777
2075	14.53913
2080	15.88121
2085	17.26468
2090	18.67155
2095	20.08547
2100	21.4942