Click on << Select >> to open the corresponding selection panel as reproduced below.
Select all the desired years by clicking on them and pressing the Shift button for continous series of years and Ctrl button for discontinous series of years. Use > to move the selected years. Use the >> button to move all years at one go. Similarly use < button to remove selected years and the < to remove all selected years. If you want to query only for the latest year check the Use the latest available year check box.
Compared to year selection in Quick Queries, the year list is static and does not reflect data availability. You may want to check TRAINS catalog or WTO IDB catalog in order to identify available years for a specific nomenclature before defining your query.
Next: Selecting Tariffs
WITS Online Help
The World Bank, 2010