Year Cases per 100,000 1990 21.95 1991 22.39 1992 22.84 1993 23.31 1994 23.79 1995 24.29 1996 24.75 1997 25.22 1998 25.71 1999 26.2 2000 26.71 2001 27.06 2002 27.42 2003 27.79 2004 28.16 2005 28.55 2006 28.9 2007 29.25 2008 29.61 2009 29.98 2010 30.36 2011 30.77 2012 31.19 2013 31.62 2014 32.05 2015 32.5 2016 32.96