Year	Percent
1950	5.12234
1955	4.92718
1960	4.68473
1965	4.51204
1970	4.41214
1975	4.33107
1980	4.26982
1985	4.23998
1990	4.58049
1995	4.70748
2000	4.7637
2005	4.85297
2010	5.10392
2015	5.37693
2020	5.69044
2025	6.0429
2030	6.46207
2035	6.85904
2040	7.29222
2045	7.79131
2050	8.33526
2055	9.157
2060	10.17521
2065	11.27278
2070	12.33986
2075	13.32289
2080	14.26099
2085	15.20959
2090	16.20967
2095	17.25916
2100	18.31704