 The heavy industry sector has declined significantly over the past 30 years.An oil refinery formerly operated in the city under several different owners (Caminol Oil Co. from 1932–1967, Beacon Oil Co. from 1967–1982 and Ultramar Oil Co. from 1982–1987) until it permanently closed in 1987.A tire manufacturing plant was built in 1962 by the Armstrong Rubber Co., which operated it until that company was purchased by the Italian manufacturer Pirelli, which eventually closed the factory in 2001.