It's based on the salary of the member when he releases from the forces. It goes on to 75% of the monthly salary he was earning. The problem we had was for soldiers at the rank of private being injured; this is where the 75% was not enough. That's why we came out with the minimum earning loss of $40,000 a year. Basically, the math is done at around 75% of the monthly base salary of the soldier.
On February 14th, 2012. See this statement in context.