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          1440       1280       1000          900
Spring          1500       1420       1620          1540
Summer       1 000      2120       2020          2 000
Fall               600         810         670           520
George has forecasted that annual demand for his sailboats in year 5 will equal 6500 sailboats.
1. 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______sailboats ​(enter a whole ​number).