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:2021-09-29, Stock:PTR, The news for the past five days is as follows:
2021-09-22: nan
2021-09-23: nan
2021-09-24: NEWS1: Oil Posts Fifth Weekly Advance as Global Markets Tighten.
2021-09-27: nan
2021-09-28: NEWS1: PetroChina (PTR) Flat As Market Sinks: What You Should Know.

Answer: Decrease