Year	Percent
2004	-64.10557
2005	-64.47793
2006	-65.19836
2007	-68.33658
2008	-61.50016
2009	-75.49468
2010	-77.80251
2011	-53.25144
2012	-46.94685
2013	-58.4073
2014	-55.93658
2015	-54.2515
2016	-56.37243