Lake County's GDP in 2010 was measured at nearly $25 billion. Manufacturing was also the largest sector of the economy in economic terms, contributing over $5.8 billion to the county's GDP in 2010. It was followed by healthcare and social assistance at $2.6 billion, public administration at $2.5 billion, and retail trade at $1.9 billion. While Lake County's average income was approximately 24% higher than the national average in 1978, in 2010 Lake County had fallen significantly behind the United States as a whole, with average income being approximately 12.9% lower. The national average surpassed Lake County sometime around 1986.