context: According to the Philippine Fiber Industry Development Authority, the Philippines provided 87.4% of the worlds abaca in 2014, earning the Philippines US$111.33 million.  The demand is still greater than the supply.  The remainder came from Ecuador (12.5%) and Costa Rica (0.1%).  The Bicol region in the Philippines produced 27,885 metric tons of abaca in 2014, the largest of any Philippine region.  The Philippine Rural Development Program (PRDP) and the Department of Agriculture reported that in 2009-2013, Bicol Region had 39% share of Philippine abaca production while overwhelming 92% comes from Catanduanes. Eastern Visayas, the second largest producer had 24% and the Davao Region, the third largest producer had 11% of the total production.  Around 42 percent of the total abaca fiber shipments from the Philippines went to the United Kingdom in 2014, making it the top importer.  Germany imported 37.1 percent abaca pulp from the Philippines, importing around 7,755 metric tons (MT).  Sales of abaca cordage surged 20 percent in 2014 to a total of 5,093 MT from 4,240 MT, with the United States holding around 68 percent of the market.
question: Across how many years did the Bicol Region have 39% share of Philippine abaca production?
answer: 4