Year Cases per 100,000 1990 46.22 1991 44.68 1992 43.22 1993 41.82 1994 40.46 1995 39.17 1996 39.14 1997 39.14 1998 39.14 1999 39.14 2000 39.16 2001 39.2 2002 39.27 2003 39.34 2004 39.42 2005 39.52 2006 39.7 2007 39.86 2008 40.05 2009 40.24 2010 40.46 2011 40.64 2012 40.85 2013 41.06 2014 41.27 2015 41.49 2016 41.73