China's latest index of export container transport hit a record high, reflecting a supply shortage of containers, mainly due to the nation's fast-growing exports.

Tracking spot and contractual freight rates from Chinese container ports for 12 shipping routes across the globe, the average China Containerized Freight Index (CCFI) stood at 1,411.98 in the week ending last Friday, up by 6.7 percent from a week earlier, the Shanghai Shipping Exchange said.

Aerial photo taken on Dec. 7, 2020 shows containers stacked at the container terminal of the Lianyungang Port in Lianyungang City, east China's Jiangsu Province. (Photo by Wang Chun/Xinhua)

The CCFI rose nearly 70 percent since late May this year, roughly the same period when major Chinese ports saw a turnaround of container throughput.

Containers have never been so sought-after, said Li Xiaohui, deputy manager of the technology department at a container company in Tianjin Port.

Affected by the COVID-19 outbreak, container throughput at the port decreased at the beginning of the year, hitting a low of fewer than 1 million 20-foot equivalent units (TEUs) in February.

This large shipping hub in north China saw its container throughput increase for the first time this year in May, standing at 1.65 million TEUs. For the first 11 months, its container throughput rose by 6.1 percent year on year to more than 17.1 million TEUs, data showed.

A crane loads a container onto a truck at Tianjin port container terminal in Tianjin, north China, Aug. 4, 2020. (Photo by Zhao Zishuo/Xinhua)

In early November, the eight major shipping hubs, including Shanghai and Ningbo, saw container throughput rising by 13.1 percent year on year, according to data from the China Ports and Harbors Association. Specifically, container throughput for foreign trade increased by 11.5 percent from a year earlier.

As a result, container manufacturers have been working 24 hours a day and seven days a week to meet the demand.

The increasingly busy ports and the short supply of containers send out a positive signal that foreign trade is gradually warming up, analysts said.

"Most of China's exports are transported by sea in containers. The upward tendency of the freight index is in line with the increasing exports," said Yin Ruizhe, the chief fixed-income analyst at China Merchants Securities Co., Ltd.

Aerial photo taken on Nov. 19, 2020 shows containers piled at the Qinzhou Port in south China's Guangxi Zhuang Autonomous Region. (Xinhua/Zhang Ailin)

Taking the lead in economic recovery globally, China saw its exports jumping by 21.1 percent year on year in November in U.S. dollar terms, the fastest growth since February 2018.

China is one of the first manufacturing giants to bounce back from the epidemic fallout thanks to a slew of stimuli targeted at resuming production. As a result, Chinese companies have received many international orders that might otherwise go to emerging markets, said Li Qilin, council member of China Chief Economist Forum.

Aerial photo taken on Sept. 24, 2020 shows a cargo ship loaded with containers at Dalian port in northeast China's Liaoning Province. (Xinhua/Yao Jianfeng)

Industry insiders have noted the ups and downs of the foreign trade container business this year and warned of uncertainties facing the container business at ports.

Strict COVID-19 inspection measures will prolong ship stays at ports and affect loading efficiencies, said Deng Guosheng, general manager of Guangzhou Port Company Limited.

As China brings the epidemic under control and after the pandemic slows down globally, export demand will continue to rise, creating new growth points for the foreign trade container business, Deng said.

However, Deng said the shipping capacity of liner companies has not fully recovered, and foreign ports' handling capacity has decreased amid the pandemic, affecting the returning speed of empty containers and leading to a short supply and volatility in freight rates.