Portsmouth and Winchester have the highest job densities in the county; 38 per cent of workplace workers in Portsmouth commuted into the city in 2011. Southampton has the highest number of total jobs and commuting both into and out of the city is high. The county has a lower level of unemployment than the national average, at 1.3 per cent when the national rate is 2.1 per cent, as of February 2018. About one third are employed by large firms. Hampshire has a considerably higher than national average employment in high-tech industries, but average levels in knowledge-based industry. About 25 per cent of the population work in the public sector. Tourism accounts for some 60,000 jobs in the county, around 9 per cent of the total.