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Among the 57 percent of mothers who received any support 7 to 9 months after separation , the average amount was $ 439 per month - -27 percent of their total income . The company said its average price for natural gas sold in the United States plunged 42 percent during the fourth quarter to $ 5.90 per thousand cubic square feet . Kariba dam , which changed the seasonal flow on the Zambezi delta , cost the shrimp fisheries about $ 10-million a year . Pew has also committed more than $ 10-million to its Project on Excellence in Journalism and close to $ 12-million to public-interest polling . Second , we will ensure strict enforcement of the new tax regime set out in the interministerial decree of March 2004 , particularly the reduction of the ONATRA tariff from US $ 16 to US $ 10 per cubic meter and the increase in the area tax from US $ 0.0625 to US $ 0.10 per hectare .