Relying on sizable foreign investment inflows to balance the current account, these did not suffice and the Central Bank was again forced to resort to borrowing to protect the peso's value against such pressure (mostly by floating bonds, then the most sought-after in the developing world). Recession helped lead to a US$1 billion surplus in 2000 and another US$6 billion in 2001; but it was too little, too late. Buffeted by generalized global instability, the international derivatives market massively shorted Argentine bonds in the second half of 2001 and on December 23, following a spate of unpopular crisis measures, the Argentine government declared a default on US$93 billion of its bonds, the largest sovereign debt default in history.