Year Percent 2000 1.25387 2001 0.81248 2002 0.6185 2003 0.69526 2004 0.82628 2005 0.97554 2006 0.70104 2007 0.493 2008 0.37572 2009 0.54982 2010 0.87539 2011 1.08942 2012 2.08066 2013 3.18298 2014 3.45109 2015 3.13771 2016 2.6061 2017 2.05603