Year	Percent
1950	5.18785
1955	5.10086
1960	5.01659
1965	4.88882
1970	4.75416
1975	4.50342
1980	4.18994
1985	3.92793
1990	4.08734
1995	4.00645
2000	3.7644
2005	3.48039
2010	3.48745
2015	3.72584
2020	4.04076
2025	4.45671
2030	5.05632
2035	5.96835
2040	7.16903
2045	8.54534
2050	9.89084
2055	11.00479
2060	12.33608
2065	13.79654
2070	15.37809
2075	16.80385
2080	18.20988
2085	19.61427
2090	21.03467
2095	22.44653
2100	23.81369