Year	Percent
1974	1.15087
1975	1.02017
1977	1.03884
1978	0.84152
1992	0.94723
2007	0.96961
2008	0.95169
2009	0.97593
2010	0.95662
2011	0.95241
2012	1.0262
2014	0.96208
2015	0.97677