Passage: In 1971, banknotes were introduced in denominations of ¼, ½, 1, 5 and 10 dinar. 20 dinar notes were added in 2002. On August 27, 2008, the Central Bank of Libya announced a new 50 dinar note and that was scheduled to enter circulation on August 31, 2008. The note is already in circulation and features Muammar Gaddafi on the obverse.

Question: When was the 10 dinar banknote introduced?
1971