Year Cases per 100,000 1990 50.76 1991 50.8 1992 50.4 1993 49.58 1994 49.54 1995 49.52 1996 49.11 1997 48.56 1998 48.31 1999 48.04 2000 48.23 2001 48.08 2002 48.79 2003 49.07 2004 49.22 2005 49.17 2006 49.18 2007 49.18 2008 48.57 2009 47.96 2010 47.12 2011 46.94 2012 46.92 2013 46.74 2014 46.9 2015 47.27 2016 47.55