Fatalities in Afghanistan are regularly reported in the media, but the numbers injured are less often examined.

The Ministry of Defence updates its counts, both of fatalities and casualties, at least monthly. Below, they are summarised on a calendar year basis.
 
Fatality and non-fatal casualty rates are tabulated per 1,000 personnel-years. Four thousand troops in a theatre of operation for 3 months contribute 1,000 personnel-years (pys). So too do 1,000 personnel in theatre for one year. A “major combat” is characterised  by a military fatality rate of 6 or more per 1,000 pys.
 
The Table below incorporates UK personnel-years from Bird and Fairweather, with the following two assumptions:
 
a)      in 2006, prior to 1 May, UK’s deployment to Afghanistan is assumed as 2,500 troops.
b)      in 2009, since 4 October, UK’s deployment to Afghanistan is taken as 9,500 troops.
 
Assumption a) may be an underestimate.
 
With the above caveat, Table presents MOD-cited fatalities (military and civilian) and casualties per 1,000 personnel-years.

Notice that the ratio of non-fatal casualties to fatalities increased sharply from under 1 in 2006 to close to 1.5 during the subsequent three calendar year periods.

Both fatality and casualty rate virtually doubled in 2009 as compared to 2007+2008. In 2009, UK forces experienced 12 fatalities and 18 non-fatal casualties per 1,000 personnel-years.