A leading insurance company says natural disasters cost the industry $65 billion last year and that Superstorm Sandy accounted for nearly two-fifths of the total. However, Munich Re AG said Thursday total insured losses from natural catastrophes were down from a record $119 billion in 2011, when devastating earthquakes in Japan and New Zealand cost the industry dear. The company said total economic costs in 2012 from natural disasters — including uninsured losses — amounted to $160 billion, compared with the previous year’s $400 billion.