The difference between the pre-invasion mortality rate and the different mortality rates after the invasion are the excess mortality rates for each period. Table 3 in the Lancet article[1] lists those rates as 2.6, 5.6, and 14.2. Why the excess mortality rate for June 2005 to June 2006 is listed as 14.2 instead of 14.3 May be due to how rounding was done.