Year % 1994 5 1997 17.17 2001 15.07 2002 13.16 2003 13.16 2005 13.17 2006 13.16 2007 11.02 2008 11.3 2009 11.3 2010 11.29 2011 11.28 2012 11.28 2014 11.31 2016 11.31 2018 12.28 2020 12.28 2021 12.28