Brazil’s consumer prices rose more than expected last year, dogging the central bank and its efforts to bring inflation back to target.

Prices increased 10.06% in December from a year ago, above the 9.96% median forecast in a Bloomberg survey. They rose 0.73% on the month, the national statistics agency reported on Tuesday.

Central bank chief Roberto Campos Neto has overseen the world’s most aggressive monetary tightening campaign in the aftermath of the pandemic, lifting borrowing costs 725 basis points since March. The move helped push the economy into recession but has yet to have a meaningful impact on current price increases, threatening stagflation just as President Jair Bolsonaro seeks a second term this year.

Annual inflation ran nearly three times the central bank’s target of 3.75% in 2021, and analysts see it above goal through 2024. Policymakers target price increases of 3.5% this year and 3.25% in 2023, with a tolerance range of plus or minus 1.5 percentage points.

The bank’s efforts have been complicated by costlier fuel, kinks in global supply chains and a series of extreme weather events, from droughts to floods, that have stoked food and raw material prices. In December, all nine baskets of goods and services tracked by the statistics agency saw price increases. Food and beverages rose 0.84% while transportation increased 0.58%, representing the biggest contributors to inflation.

Policymakers hiked interest rates by 150 basis points in December and signaled another increase of the same magnitude was likely when they meet again in February.

But Tuesday’s disappointing data left some investors wondering if the bank’s current pace of monetary tightening would be sufficient. Analysts pointed out that many items saw price increases in December after Black Friday sales expired from the previous month, while industrial goods also shot up in cost, signaling that inflation remains widespread.

“It’s not a number that helps the market have a clearer outlook going forward,” said Carlos Menezes, a portfolio manager at Gauss Captial in Sao Paulo.

Given that annual inflation ended 2021 above the upper limit of the bank’s tolerance range, Campos Neto will be obligated by law to publish an open letter explaining why it happened and what will be done to bring it to target.

Every central bank president has had to write such a letter in at least one occasion since Brazil adopted its inflation targeting regime in 1999.

Andrew Rosati reports for Bloomberg News.

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