| The table below contains the numeric data used to create the graph. | 
 
 
| 
 Year 
 | 
 Cases 
 | 
| 
 1990 
 | 
 838 
 | 
| 
 1991 
 | 
 862 
 | 
| 
 1992 
 | 
 849 
 | 
| 
 1993 
 | 
 278 
 | 
| 
 1994 
 | 
 83 
 | 
| 
 1995 
 | 
 69 
 | 
| 
 1996 
 | 
 51 
 | 
| 
 1997 
 | 
 59 
 | 
| 
 1998 
 | 
 33 
 | 
| 
 1999 
 | 
 62 
 | 
| 
 2000 
 | 
 90 
 | 
| 
 2001 
 | 
 135 
 | 
| 
 2002 
 | 
 241 
 | 
| 
 2003 
 | 
 236 
 | 
| 
 2004 
 | 
 154 
 | 
| 
 2005 
 | 
 117 
 | 
| 
 2006 
 | 
 104 
 | 
| 
 2007 
 | 
 87 
 | 
| 
 2008 
 | 
 68 
 | 
| 
 2009 
 | 
 36 
 | 
| 
 2010 
 | 
 28 
 | 
| 
 2011 
 | 
 20 
 | 
| 
 2012 
 | 
 13 
 | 
| 
 2013 
 | 
 19 
 | 
| 
 2014 
 | 
 12 
 | 
 
 
Source: Public Health England (now UKHSA) and the Health Protection Agency Archive