context: By employment, Ohios largest sector is trade, transportation and utilities, which employs 1,010,000 Ohioans, or 19.4% of Ohios workforce, while the health care industry and education sector employs 825,000 Ohioans (15.8%). Government employs 787,000 Ohioans (15.1%), manufacturing employs 669,000 Ohioans (12.9%), and professional and technical services employs 638,000 Ohioans (12.2%). Ohios manufacturing sector is the third-largest of all fifty United States states in terms of gross domestic product. Fifty-nine of the United States top 1,000 publicly traded companies (by revenue in 2008) are headquartered in Ohio, including Procter & Gamble, Goodyear Tire & Rubber, AK Steel, Timken Company, Abercrombie & Fitch, and Wendys.
question: What industries make up the smallest percentage of Ohio's workforce?
answer: professional and technical services