According to Paraguayan Central Bank (BCP) data, Paraguay's real GDP in 2004 of $7.98 billion (in 1994 dollars) represented an increase of 3.9% from 2003. Data with the new base year was released in 2005. IMF data using the prior base year of 1982 shows real GDP growth of 2.9% in 2004. The per capita GDP rose to $1,173 in current U.S. dollar terms in 2004, but has fallen by more than a third since the peak of $1,793 in 1996. Given the importance of the informal sector, accurate economic measures are difficult to obtain. Paraguay presently maintains a balance-of-payments surplus. It runs a deficit in the trade of goods, but a large surplus in services, reflecting large exports of electricity from Paraguayís two large hydroelectric dams shared with Brazil and Argentina. In 2004, official foreign exchange reserves rose to $1.17 billion, an increase of $184.2 million over 2003, and an increase of almost 50% from 2002 ($582.8 million). Foreign official debt rose slightly to $2.35 billion. Inflation in 2004 dropped to 2.8%, down from 9.3% in 2003 and the lowest rate since 1970.