Rubber increased on Monday after it fell into a bear territory on April 1 amid weaker Yen, which dropped to the lowest level since October 2008 versus the U.S. Dollar and as Chinese imports were boosted for restocking. Rubber for delivery in four months climbed 1.8% to 299 yen a kilogram and it has gained 22% since the lowest level recorded this year at 245.2 yen on April 18.