Egyptian President Abdel Fattah al-Sisi said Monday that revenues from the Suez Canal had "decreased by 40 to 50 percent" so far this year due to attacks on shipping by Yemen's Houthi rebels. "See what is happening at our borders... with Gaza, you see the Suez Canal, which used to bring Egypt nearly $10 billion per year, (these revenues) have decreased by 40 to 50 percent and Egypt must continue to pay companies and partners," Sisi said during a conference with oil companies.