China's seas will contribute $433b or more than five percent of the country's gross domestic product (GDP), in 2010, according to a report on China's marine development. The report, issued on Friday by the State Oceanic Administration (SOA), also predicted the country's offshore crude oil output would exceed 50 million tons. It said China's current offshore oil and gas exploration was "still in an infant stage", with 80 percent of oil and gas resources yet to be tapped. The country's explored crude oil only accounted for 17.6 percent of the reserve at sea, and natural gas that was tapped out only made up 11.9 percent of the national sea reserve, it said.