5) Sichuan earthquake, China
Cost: $29 billion (by the World Bank)
The Sichuan earthquake, also known as Wenchuan earthquake was a deadly natural disaster which happened in the year 2008, killing around 70, 000 people and it left more than 18, 000 missing. In this region almost 4 million people lived and the earthquake of magnitude 8.0 turned out to be a came tragedy; apart from that strong aftershocks exceeding magnitude 6 continued to hit the region even after months resulting in furthermore damages.