Year Cases per 100,000 1990 25.06 1991 25.48 1992 25.93 1993 26.38 1994 26.85 1995 27.33 1996 27.6 1997 27.89 1998 28.18 1999 28.47 2000 28.78 2001 29.28 2002 29.79 2003 30.32 2004 30.87 2005 31.43 2006 31.41 2007 31.38 2008 31.36 2009 31.34 2010 31.33 2011 31.58 2012 31.85 2013 32.12 2014 32.39 2015 32.66 2016 32.96