% Increase in Strength for filling in Cement Block Wall with cement and rebar

[GWHH]

For the life of me. I can't remeber the exact number and can't find the info on this subject here. When you take a standard cement block wall of 6 or 8 inch thinkess and its a load bearing wall and fill it up with cement and rebar.

What % does the strength of that wall increase by is it 40% or 60%. I know its one of those numbers, but can't remeber for sure off hand.

Thanks.