Year Cases per 100,000 1990 54.95 1991 55.19 1992 54.12 1993 55.07 1994 57.4 1995 57.58 1996 54.65 1997 53.94 1998 53.74 1999 53.79 2000 55.52 2001 55.3 2002 55.64 2003 55.77 2004 56.33 2005 57.14 2006 57.49 2007 56.6 2008 54.65 2009 53.42 2010 52.99 2011 52.52 2012 52.12 2013 51.32 2014 50.46 2015 49.59 2016 48.92