While an annual report on solar jobs showed a decline nationwide for 2018, Iowa saw a slight increase.The Washington, D.C.-based Solar Foundation’s ninth-annual National Solar Job Census, released Tuesday, reported a bump of 4 percent in solar-related jobs in Iowa — from 815 in 2017 to 844 last year. Almost 100 Iowa businesses are part of the solar energy supply chain, it found.Twenty-eight other states experienced some growth in solar-related occupations, the census noted.