Lloyd's worst results in its long history were in the 1989 through 1991 years, each producing overall losses of over £2bn; the late 1990s were also punctuated by repeated and significant underwriting losses. In 2001 the calendar year result was a 140 per cent combined ratio, driven largely by claims arising out of the World Trade Center attack, reserve increases for prior-year liabilities and deteriorating pricing levels. However, the market subsequently enjoyed profitability in most years except those marked by unusual levels of large natural catastrophes. For example, the 2005 Atlantic hurricane season (which included Hurricane Katrina) drove the Lloyd's overall combined ratio to 112 per cent, while the 2017 Atlantic hurricanes coupled with destructive wildfires in California caused the Lloyd's market to report a 114 per cent combined ratio result in that year.