Context: The Houston–The Woodlands–Sugar Land MSA's gross domestic product (GDP) in 2012 was $489 billion, making it the fourth-largest of any metropolitan area in the United States and larger than Austria's, Venezuela's, or South Africa's GDP. Only 26 countries other than the United States have a gross domestic product exceeding Houston's regional gross area product (GAP). In 2010, mining (which consists almost entirely of exploration and production of oil and gas in Houston) accounted for 26.3% of Houston's GAP up sharply in response to high energy prices and a decreased worldwide surplus of oil production capacity, followed by engineering services, health services, and manufacturing.

Question: What was Houston's gross domestic product in 2012?
Answer: $489 billion

Question: Where in the rankings does Houston's gross domestic product place it compared to other U.S. domestic areas?
Answer: fourth-largest

Question: How many other countries have a gross domestic product exceeding Houston's?
Answer: 26

Question: How much did oil and gas exploration and production make up Houston's gross product?
Answer: 26.3%

Question: Under what category does oil and gas exploration fall?
Answer: mining

Question: What was Houston's gross domestic product in 2001?
Answer: Unanswerable

Question: Where in the rankings does Texas's gross domestic product place it compared to other U.S. domestic areas?
Answer: Unanswerable

Question: ow many other countries have a gross domestic product exceeding Texas's?
Answer: Unanswerable

Question:  How much did oil and gas exploration and production make up Texas's gross product?
Answer: Unanswerable

Question:  Under what category does ocean exploration fall?
Answer: Unanswerable