The United Nations Conference on Trade and Development site provides historical data series to the 1940s for many indicators; in depth intra-regional and intra-trade group data; extensive data on bilateral trade flows; disaggregated product level merchandise trade flows by country, region and trade group; tourism and merchant fleet data; detailed disaggregation of services trade data; prices and value added for commodities; BoP, reserves, financial flows, and long term external debt data; Millennium Development Goals data; and TRAINS tariff data, available through WITS.