when did the currency of botswana came in circulation
Botswana pula The pula was introduced in 1976, replacing the South African rand at par. Despite a 12% devaluation in May 2005, the pula remains one of the strongest currencies in Africa.[citation needed]
Nigerian naira On January 1, 1973, the Central Bank of Nigeria introduced notes for 50 kobo, 1, 5, 10 and 20 naira. The 50 kobo notes were last issued in 1989. In 1991, 50 naira notes were issued, followed by 100 naira in 1999, 200 naira in 2000, 500 naira in 2001 and 1000 naira on October 12, 2005.