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:2018-06-21, Stock:PTR, The news for the past five days is as follows:
2018-06-14: NEWS1: China Shares Draw Firm Lead For Friday.NEWS2: China Shares Draw Firm Lead For Friday.
2018-06-15: NEWS1: Integrated Energy Losses This Week: PTR, YPF, CVE, PBR, and SU.NEWS2: Venezuela oil exports to China slump, may hit lowest in nearly 8 years - sources, data.NEWS3: Sour brew - New tax rules take steam out of China's teapot refiners.
2018-06-18: NEWS1: Losing Streak Tipped To Continue For China Stock Market.NEWS2: Losing Streak Tipped To Continue For China Stock Market.NEWS3: Analyzing Wall Street Targets for INT, DK, E, and PTR.NEWS4: Sum Up The Pieces: ADRA Could Be Worth $41.NEWS5: Sum Up The Pieces: ADRA Could Be Worth $41.NEWS6: Are Hedge Funds Buying INT, DK, E, and PTR?.
2018-06-19: NEWS1: More Pain Predicted For China Stock Market.NEWS2: More Pain Predicted For China Stock Market.
2018-06-20: NEWS1: China Stock Market May Add To Its Winnings.NEWS2: China Stock Market May Add To Its Winnings.

Answer: Decrease