Singapore’s central bank made a record net profit of 24.3 billion Singapore dollars ($18.6 billion) in the last financial year, bolstered by positive currency translation effects and higher investment gains.

The Monetary Authority of Singapore (MAS), however, said it is “not popping the champagne” yet as its profits and losses are subject to wild swings. The record gains followed a net profit of 200 million Singapore dollars in the previous fiscal year. The MAS follows an April to March financial year.

“They (the profits) do not reflect the underlying investment approach of the MAS which is conservative and emphasises steady, long-term returns,” MAS managing director Ravi Menon said at a press briefing Thursday.

Currency translation effects, reflecting the depreciation of the Singapore dollar against the U.S dollar and the Japanese yen, amounted to 8.2 billion Singapore dollars in the year ending March 2017. That helped the MAS to make a gain of 30.1 billion Singapore dollars from the investments of its official foreign reserves.

At the end of the financial year, the central bank’s official foreign reserves on its balance sheet were 362.8 billion Singapore dollars. About three-quarters of MAS’ official foreign reserves are denominated in U.S. dollar, euro, yen and pound. Investment-grade bonds in advanced economies make up the largest allocation in the portfolio.

Assets held by the MAS are mainly to manage the Singapore dollar’s value against a basket of currencies. The responsibility of ensuring returns on the Southeast Asian city-state’s reserves lies primarily on wealth fund GIC.

On the Singapore economy, MAS reiterated the official forecast for growth to come in between 1 and 3 percent this year and core inflation to accelerate by between 1 and 2 percent. But the current neutral monetary policy stance is still needed for “an extended period to ensure medium-term price stability,” the central bank noted.

The small, export-reliant Singaporean economy is particularly vulnerable to developments in the global environment. Menon said the world is in a better shape than it has been in a long while, with growth seen picking up across both advanced and emerging economies.

The improving climate also means that the global economy should be able to absorb the ongoing increase in U.S. interest rates, added Menon.

“But vigilance is still called for: economies and markets have been accustomed to Low interest rates. They could be thrown off balance if rates rose faster than expected,” he said, adding that trade protectionism, disorderly Brexit negotiations and rising populist sentiments continue to be key tail risks.