Year Cases per 100,000 1990 65.45 1991 64.88 1992 64.57 1993 64.48 1994 63.31 1995 62.73 1996 62 1997 60.84 1998 59.89 1999 58.73 2000 57.28 2001 55.81 2002 55.42 2003 54.81 2004 53.85 2005 53.3 2006 52.79 2007 52.37 2008 52.21 2009 52.06 2010 51.34 2011 51.16 2012 50.93 2013 50.62 2014 49.73 2015 48.99 2016 48.46