What percentage was for home acquisition debt or improvement? 

IRS Pub 936

Reverse mortgages.

A reverse mortgage is a loan where the lender pays you (in a lump sum, a monthly advance, a line of credit, or a combination of all three) while you continue to live in your home. With a reverse mortgage, you retain title to your home. Depending on the plan, your reverse mortgage becomes due, with interest, when you move, sell your home, reach the end of a pre-selected loan period, or die. Because reverse mortgages are considered loan advances and not income, the amount you receive isn't taxable. Generally, any interest (including original issue discount) accrued on a reverse mortgage is considered interest on home equity debt and isn’t deductible.