George Kyparisis owns a company that manufactures sailboats. Actual demand for? George's sailboats during each of the past four seasons was as? follows:
Season,1,2,3,4
Winter,"1,400","1,200","1,000",920
Spring,"1,500","1,400","1,620","1,540"
Summer,"1,000","2,120","2,020","2,000"
Fall,600,750,670,500
George has forecasted that annual demand for his sailboats in year 5 will equal 5,600 sailboats. Based on the given data and using the multiplicative seasonal? model, the demand level for? George's sailboats in the spring of year 5 will be nothing sailboats ?(enter a whole ?number).