Experts estimate that total spending on American military and non-military intelligence during the Cold War peaked at $71 billion (in 2013 dollars) in the late 1980s. By 1994 spending for the non-military National Intelligence Program (NIP) had declined to $43.4 billion. Fiscal 2013 intelligence spending exceeded the Cold War peak, at $52.6 billion for NIP and $23 billion for military intelligence programs. In constant dollars it is about double the estimated 2001 budget and 25% greater than the 2006 budget. From the September 11 attacks on the United States in 2001 to 2013, the government has spent more than $500 billion on intelligence.