Credit default swaps in their current form have existed since the early 1990s, and increased in use in the early 2000s. By the end of 2007, the outstanding CDS amount was $62.2 trillion, falling to $26.3 trillion by mid-year 2010 and reportedly $25.5 trillion in early 2012. CDSs are not traded on an exchange and there is no required reporting of transactions to a government agency. During the 2007–2010 financial crisis the lack of transparency in this large market became a concern to regulators as it could pose a systemic risk. In March 2010, the Depository Trust & Clearing Corporation (see Sources of Market Data) announced it would give regulators greater access to its credit default swaps database.