Malaysia’s ringgit fell for an 11th week in its longest stretch of losses since 1993 as lower energy prices weigh on the oil exporter’s earnings and capital flows out of emerging markets amid slowing Chinese growth.

The nation’s foreign-exchange reserves have fallen 19 percent this year, fueling speculation the central bank bought the ringgit to stem declines in Asia’s worst-performing currency. Data for the last two weeks of August are due after markets close today, while a report on exports due at noon is forecast to show growth slowed and the trade surplus shrank.

Malaysia’s benchmark stock index dropped this week and is down more than 9 percent in 2015, with a US interest-rate increase likely to spur more outflows.

“For the ringgit, it has almost become a perfect storm,” said Mitul Kotecha, head of Asia Pacific currency strategy at Barclays Plc in Singapore. “The external position has come under focus. There are lower oil prices, weaker external demand and looming Federal Reserve rate hikes.”

The ringgit depreciated 1.4 percent in the past five days and 0.3 percent today to 4.2595 a dollar as of 10.30am in Kuala Lumpur, according to prices from local banks compiled by Bloomberg. It has weakened 18 percent this year and fell to a 17-year low of 4.2990 on Aug 26.

Brent crude has halved in the past year, lowering government revenue for Malaysia, which derives 22 percent of its income from oil-related sources. Exports rose 3.2 percent in July from a year earlier, after advancing 5 percent the previous month, according to the median estimate of economists in a Bloomberg survey. The trade surplus narrowed to RM6.3 billion from RM7.98 billion.

Malaysia’s reserve holdings declined 2.3 percent to a six- year low of US$94.5 billion in the first 14 days of August from two weeks earlier. While the reserves remain sufficient, their adequacy is the weakest among the 10 Association of South-East Asian countries, Moody’s Investors Service sovereign analyst Christian de Guzman said in an Aug 27 briefing in Kuala Lumpur.

Government bonds advanced, with the 10-year yield falling 16 basis points this week and two basis points today to 4.24 percent, according to prices from Bursa Malaysia.

- Bloomberg