Year Cases per 100,000 1990 44.95 1991 46.86 1992 48.92 1993 51.15 1994 53.55 1995 56.14 1996 54.84 1997 53.64 1998 52.51 1999 51.47 2000 50.51 2001 51.95 2002 53.46 2003 55.06 2004 56.73 2005 58.5 2006 58.41 2007 58.32 2008 58.25 2009 58.19 2010 58.14 2011 57.69 2012 57.25 2013 56.81 2014 56.39 2015 55.97 2016 55.57