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TUNIS, March 31 (Reuters) - Tunisia's central bank kept its key interest rate unchanged at 4.25 percent, the bank said on Thursday.

The bank last cut its main interest rate in October, from 4.75 percent, in a bid to boost economic growth as inflation fell. The inflation rate was 4.9 percent in 2015, down from 5.5 percent in 2014.

The central bank said tourism revenue in first two months in 2016 fell by 54 percent to 182 million dinars ($90.21 million) compared to the same period of 2015 after a two major attacks targeted the industry, killing dozens of foreigners last year.

Foreign currency reserves totaled 12.65 billion dinars ($6.27 billion) by the end of February, the equivalent of 116 days of imports and up from 14.10 billion dinars ($6.99 billion)a year ago, the bank said in statment. ($1 = 2.0176 Tunisian dinars)

(Reporting By Tarek Amara Editing by Jeremy Gaunt) ((tarek.amara@thomsonreuters.com;))