Year	Percent
1950	4.54855
1955	4.22523
1960	4.18861
1965	4.19856
1970	4.16069
1975	4.56039
1980	4.36834
1985	4.18585
1990	4.27524
1995	4.06579
2000	4.05963
2005	3.87457
2010	3.81784
2015	4.0809
2020	4.44958
2025	4.61726
2030	4.64984
2035	4.55995
2040	4.80443
2045	5.28186
2050	5.92914
2055	6.58317
2060	7.05624
2065	7.54207
2070	8.3212
2075	9.28797
2080	10.32493
2085	11.31345
2090	12.21052
2095	13.13068
2100	14.17063