Burundi's tax revenues rose 9.1 per cent year-on-year to 384.7 billion francs ($257.5 million) in the nine months to September, thanks to efforts to fight corruption and a broadening of the tax base, the country's revenue board said on Wednesday."The tax base grew with a registration of 5,000 new contributors who were in the informal sector and who didn't pay tax before," the revenue authority said in its report.Monthly tax revenues collected in September this year fell to 41 billion francs from 44.5 billion francs in September 2011. The board said this was due to the government's decision to suspend tax on basic food imports to the landlocked central African country, to ease the impact of soaring prices of essential commodities.The decision came into effect in May and will last until the end of December.In order to plug a $64 million revenue deficit on the current 2012 budget, the government has raised taxes on beer, liquors, mineral water and other soft drinks.