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:2018-09-21, Stock:PTR, The news for the past five days is as follows:
2018-09-14: NEWS1: Shell Stock: What to Expect by the End of Q3 2018.
2018-09-17: NEWS1: Losing Streak Likely To Continue For China Shares.NEWS2: Losing Streak Likely To Continue For China Shares.NEWS3: Shell’s Short Interest Has Risen Marginally.
2018-09-18: NEWS1: China Stock Market Draws Firm Lead For Wednesday.NEWS2: China Stock Market Draws Firm Lead For Wednesday.
2018-09-19: NEWS1: China Shares May See Continued Support.NEWS2: China Shares May See Continued Support.
2018-09-20: NEWS1: Renewed Support Expected For China Bourse.NEWS2: Renewed Support Expected For China Bourse.NEWS3: Total Stock Is Up 4% in Q3 2018 despite Oil’s Fall.

Answer: Decrease