Year	Percent
1950	4.84003
1955	4.23374
1960	4.03715
1965	4.19589
1970	4.51668
1975	4.86548
1980	5.12807
1985	5.23513
1990	5.52056
1995	5.13514
2000	4.59595
2005	4.17219
2010	3.73599
2015	3.57092
2020	3.42941
2025	3.4014
2030	3.59001
2035	3.9784
2040	4.43025
2045	4.86189
2050	5.25021
2055	5.69994
2060	6.30501
2065	7.19156
2070	8.33786
2075	9.51276
2080	10.68392
2085	11.91373
2090	13.21589
2095	14.56441
2100	15.91983