Year Cases per 100,000 1990 46.37 1991 46.12 1992 46.01 1993 46.06 1994 46.06 1995 46.08 1996 46.2 1997 46.22 1998 46.19 1999 46.64 2000 46.82 2001 47.13 2002 47.58 2003 48.05 2004 48.58 2005 48.65 2006 48.38 2007 48.29 2008 48.21 2009 48.13 2010 48.08 2011 47.98 2012 47.85 2013 47.72 2014 47.61 2015 47.5 2016 47.42