Year	Percent
1950	5.49096
1955	5.52343
1960	5.57769
1965	5.59909
1970	5.57808
1975	5.52386
1980	5.42224
1985	5.26227
1990	5.50564
1995	5.34007
2000	5.17763
2005	5.00808
2010	4.86311
2015	4.7812
2020	4.76128
2025	4.87488
2030	5.12942
2035	5.54877
2040	6.16897
2045	7.02375
2050	7.97745
2055	8.90702
2060	9.82946
2065	10.92005
2070	12.17884
2075	13.49954
2080	14.7865
2085	16.04451
2090	17.27939
2095	18.51126
2100	19.73435