EC Library Guide to information on the European integration history: International Organisations

OECD Statistics
In OECD iLibrary select the Statistics tab.

Depending on the indicators, the OECD statistical databases contain a range of annual statistics and indicators dating back to the early 20th century.
WTO World Trade Organization iLibrary - Statistics
In WTO iLibrary select the Statistics tab.

Depending on the indicators, the WTO statistics contain a range of annual statistics dating back to the early 1950s.
IMF International Monetary Fund Statistics
In IMF eLibrary click on Topics and select Statistics.

Depending on the indicators, IMF statistics contain a range of statistics dating back to the 1950s.