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:2019-12-18, Stock:PTR, The news for the past five days is as follows:
2019-12-11: NEWS1: Kunlun Energy Company Limited -- Moody's: Kunlun Energy's ratings not affected by negotiations with China Oil & Gas Pipeline Network Corporation.
2019-12-12: nan
2019-12-13: nan
2019-12-16: nan
2019-12-17: nan

Answer: Decrease