The report also shows that increases were recorded in all COICOP divisions that yield the Headline Index.
The composite food index, which measures the capacity of people to feed, rose by 13.45 per cent in during the month.
RBI had said the decision of the Monetary Policy Committee to hike the rate was consistent with the neutral stance and in consonance with the objective of achieving the medium-term target for CPI inflation of 4 per cent within a band of (+/-) 2 per cent, while supporting growth.
This, it noted was down by 0.2 per cent from the rate recorded in April, which was 10.9 per cent. It increased 3.1 percent in May compared with a 2.8 percent rise in the previous month.
The NBS report further stated that the urban inflation rate dropped to 12.08 per cent year-on-year in May from 12.89 per cent recorded in April, while the rural inflation rate also dropped to 11.20 per cent in May from 12.13 per cent in April. This was caused by the increase in price of potatoe, yam and other tubers, fish, bread and cereals, Oil and fats, vegetables, coffee, tea and cocoa, Meat, Milk, cheese and eggs.
The Reserve Bank of India (RBI) last week raised its benchmark interest rate for the first time since 2014, by 25 basis points to 6.25 per cent, citing inflation concerns. The average annual rate of change of the Food sub-index for the twelve-month period ending May 2018 over the previous twelve-month average was 18.36 percent, 0.53 percent points from the average annual rate of change recorded in April (18.89) percent.
In the same vein, the urban index rose by 1.10% in May 2018.
The report read in part, "The Consumer Price Index, which measures inflation, increased by 11.61 per cent year-on-year in May 2018".
Analysts at German brokerage Deutsche Bank also said they expect a 0.25 per cent rate hike by the RBI at the August review, saying an inflation targeting central bank will feel the need to tighten the policy based on these "signals" from inflation.
Ben Brettell, senior economist at Hargreaves Lansdown, said: "Some will say these figures add weight to the case for higher rates". Kogi followed with 9.07% while Delta recorded 9.22% on a year-on-year all item basis in May, 2018.