Year	Percent
1950	8.85294
1955	8.03366
1960	7.50697
1965	8.64814
1970	9.35288
1975	8.85884
1980	7.20742
1985	6.08862
1990	6.1848
1995	6.18746
2000	6.21746
2005	5.51567
2010	5.0903
2015	4.85916
2020	4.9066
2025	5.06432
2030	5.05072
2035	4.8716
2040	4.64736
2045	4.53708
2050	4.58858
2055	4.73591
2060	4.86961
2065	4.89563
2070	4.83623
2075	4.76731
2080	4.76234
2085	4.81151
2090	4.86954
2095	4.8826
2100	4.83891