Most Toyota plants are under a production freeze this week and the company is now considering adding more work freezes as it deals with a monthly sales drop of more than a third. The company announced Tuesday plans to halt production for 11 days over the next two months at some Japanese plants, but didn’t make any announcements concerning North America. U.S. sales fell by 37 percent in December a trend seen throughout the auto industry. GM saw its worst year in nearly half a decade while overall industry sales declined by 18 percent. Chrysler and GM have both idled plants this month in an attempt keep down overproduction. Meanwhile, Korean carmaker Hyundai has taken the unusual step of offering buyers the option to return new cars purchased within a year if they lose their jobs.