Year Cases per 100,000 1983 23.675 1984 27.16 1985 32.095 1986 37.62 1987 42.735 1988 47.58 1989 52.405 1990 56.28 1991 57.96 1992 59.72 1993 61.55 1994 63.45 1995 65.45 1996 66.7 1997 68.02 1998 69.37 1999 70.76 2000 72.19 2001 74.31 2002 76.54 2003 78.86 2004 81.28 2005 83.8 2006 85.4 2007 87.06 2008 88.77 2009 90.55 2010 92.38 2011 91.73 2012 91.08 2013 90.46 2014 89.85 2015 89.26 2016 88.77