You can use INDEX/MATCH like below. Both formulas need to be array entered i.e. CTRL+SHIFT+ENTER.
For HeadCount in cell M6
=INDEX($G$5:$G$14,MATCH($K6&$L6&M$5,$D$5:$D$14&$E$5:$E$14&$F$5:$F$14,0))
For %Completion in cell Q6
=INDEX($H$5:$H$14,MATCH($K6&$L6&Q$5,$D$5:$D$14&$E$5:$E$14&$F$5:$F$14,0))
Both can then be copied down and across.