Year Percent 1995-01-01 0.7828920000000000 1996-01-01 1.2636900000000000 1997-01-01 1.9206500000000000 1998-01-01 1.7733599999999998 1999-01-01 6.4113000000000000 2000-01-01 8.6121800000000000 2001-01-01 9.1472500000000000 2002-01-01 10.7489000000000000 2003-01-01 10.8895000000000000 2004-01-01 11.6156000000000000 2005-01-01 10.1170000000000000 2006-01-01 13.6507000000000000 2007-01-01 13.4708000000000000 2008-01-01 10.4469000000000000 2009-01-01 20.8041000000000000 2010-01-01 26.5922000000000000 2011-01-01 25.8496000000000000 2012-01-01 28.6596000000000000 2013-01-01 25.3321000000000000 2014-01-01 25.9029000000000000 2015-01-01 28.5370000000000000 2016-01-01 25.6857000000000000