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:2019-09-20, Stock:PTR, The news for the past five days is as follows:
2019-09-13: nan
2019-09-16: nan
2019-09-17: NEWS1: New Strong Sell Stocks for September 17th.NEWS2: Saudi Aramco to delay some of PetroChina's October oil loadings - source.
2019-09-18: NEWS1: Top Analyst Reports for AbbVie, Union Pacific & CSX.NEWS2: New Strong Sell Stocks for September 18th.
2019-09-19: nan

Answer: Decrease