Natural and man-made disasters cost US$92 billion (S$124 billion) in 2015, compared with US$113 billion in 2014, the Swiss reinsurer Swiss Re said in report Wednesday.
Global insured losses were US$37 billion, far below the US$62 billion annual average of the last 10 years, it said.
The biggest single insured-loss of the year was the twin explosions at the port of Tianjin, northeastern China, in August which was estimated to cost between US$2.5 and US$3.5 billion.
This was followed by a storm in the United States in February, which left insurers with a bill of US$2.1 billion.
Out of 353 disaster events, 198 were natural catastrophes, the highest number in any one year, Swiss Re said.
The report is the final version of a preliminary estimate last December which said all disasters in 2015 cost US$85 billion.
Around US$80 billion of the US$92 billion losses came from natural disasters, led by the earthquake in Nepal, which cost US$6 billion - a figure that includes damage reported in India, China and Bangladesh - and killed nearly 9,000 people, making it the deadliest single disaster event in 2015.
The report said the blasts in Tianjin, which also killed 173 people, were the costliest insurance loss event ever in Asia, and the third costliest worldwide, on a list headed by the 9/11 terror attacks on the United States, estimated at US$25.2 billion.
The Tianjin disaster "has put a spotlight on accumulation risk in large transportation hubs such as ports," the report noted."The imposition of an exclusion zone at the site due to the risk of follow-up explosions and clean-up operations made it very difficult for insurers to assess the losses arising from the many damaged or destroyed assets, such as the many cars in transit at the port," it said.