RBI's base price index changed from 1993-94 to 2004-05 in RBI monthly bulletin. we have contract awarded from May'2010 in which price variation is there based on RBI Index with base as 93-94. But now current month index is not available for 93-94 base. RBI is now publishing only with base as 2004-05. How to convert May -10 to till date index which is basing on 93-94 to 2004-05 base.