Based on the news about the stock in the past five trading days, please predict the rise or fall of the stock in the next trading day. If the stock is predicted to rise in the next trading day, please output [Rise], if the stock is predicted to fall in the next trading day, please output [Decrease].

Date:2018-01-09, Stock:PTR, The news for the past five days is as follows:
2018-01-02: NEWS1: Additional Support Tipped For China Shares.
2018-01-03: NEWS1: China Bourse Tipped To Open In The Green.NEWS2: Shell (RDS.A) Calls off Demark Refinery Unit Divestment Deal.
2018-01-04: NEWS1: China Shares May Challenge 3,400-Point Plateau.
2018-01-05: nan
2018-01-08: NEWS1: China Stock Market May Spin Its Wheels On Tuesday.

Answer: Decrease