The annual headline rate in the first half of this month — above the 4.01% consensus forecast of analysts polled by Reuters — is the highest since the first 15 days of December.

Consumer prices rose 0.09% in the first 15 days of the month from the previous 15 days, driven in part by a surprise bump in chicken prices, while the less volatile core price index climbed 0.16% in early May, coming it at 3.97% on an annual basis.

The Bank of Mexico lowered its interest rate to 8.50% amid inflation control and trade uncertainties. The decision follows a trend to support economic activity amidst trade tensions with the U.S. Analysts express concerns that U.

Tuesday’s report could provide an early read on how Trump’s duties will affect the prices Americans pay for necessities.