Despite limited listings, 2013 was a great year to be a seller in the Ventura County residential real estate market. Last year, due to the limited supply of homes on the market, there were at times as many as 15 offers per home, which in turn raised the median sales price per home. Competition from investors has dwindled as the inventory levels have dried up. Prices are still on the rise, but not as quickly as they were at different points throughout last year. DataQuick Information Systems posted its December figures Tuesday, the final piece in a full year’s data set for 2013. The median price paid for a home in Ventura County averaged $428,188 last year, up nearly 20 percent from $357,000 in 2012. There were 9,947 new and resale houses and condos that sold, down 0.6 percent from 2012.