Year	Percent
1950	4.20957
1955	3.88063
1960	3.75441
1965	3.73637
1970	3.74342
1975	3.77536
1980	3.81127
1985	3.82506
1990	4.00222
1995	3.85792
2000	3.4542
2005	3.2114
2010	3.00473
2015	2.87579
2020	2.81157
2025	2.89634
2030	3.20259
2035	3.67215
2040	4.21844
2045	4.80377
2050	5.44725
2055	6.21289
2060	7.09923
2065	8.15843
2070	9.34812
2075	10.61661
2080	11.94631
2085	13.33554
2090	14.76925
2095	16.22101
2100	17.67379