Sarawak is abundant in natural resources, and primary industries such as mining, agriculture, and forestry accounted for 32.8% of its economy in 2013. It also specialises in the manufacture of food and beverages, wood-based and rattan products, basic metal products, and petrochemicals, as well as cargo and air services and tourism. The states gross domestic product (GDP) grew by 5.0% per year on average from 2000 to 2009, but became more volatile later on, ranging from −2.0% in 2009 to 7.0% in 2010. Sarawak contributed 10.1% of Malaysias GDP in the nine years leading up to 2013, making it the third largest contributor after Selangor and Kuala Lumpur. From 2006 to 2013, the oil and gas industry accounted for 34.8% of the Sarawak governments revenue. It attracted RM 9.6 billion (US$2.88 billion) in foreign investments, with 90% going to the Sarawak Corridor of Renewable Energy (SCORE), the second largest economic corridor in Malaysia.
Question: How many years did the GDP grow by 5.0% per year?
Answer: 9