The creamy layer (income) criteria were defined as gross annual income of parents from all sources more than 100,000 rupees (₹ or INR defined by Sattanathan committee in 1971) In 1993 when "creamy layer" ceiling was introduced, it was ₹ "1 lakh". It was subsequently revised to "Rs 2.5 lakh" per "annum" in (2004), and revised to ₹ 4.5 lakh (2008), Rs 6 lakh (2013) and Rs 8 lakh (2017). In October 2015, the National Commission for Backward Classes (NCBC) proposed that a person belonging to Other Backward Class (OBC) with gross annual income of parents up to Rs 15 lakh should be considered as the minimum ceiling for OBC. The NCBC also recommended the sub-division of OBCs into "backward", "more backward", and "extremely backward" blocs and divide 27% quota amongst them in proportion to their population, to ensure that stronger OBCs don't corner the quota benefits.