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:2018-05-21, Stock:PTR, The news for the past five days is as follows:
2018-05-14: NEWS1: China Bourse May Extend Monday's Gains.NEWS2: China Bourse May Extend Monday's Gains.NEWS3: Marathon Oil Corporation (MRO) Ex-Dividend Date Scheduled for May 15, 2018.NEWS4: Marathon Oil Corporation (MRO) Ex-Dividend Date Scheduled for May 15, 2018.NEWS5: Cabot Oil & Gas Corporation (COG) Ex-Dividend Date Scheduled for May 15, 2018.NEWS6: Cabot Oil & Gas Corporation (COG) Ex-Dividend Date Scheduled for May 15, 2018.NEWS7: MOVES -PetroChina's head of products trading to lead global natgas team.
2018-05-15: NEWS1: Rally May Stall For China Stock Market.NEWS2: Rally May Stall For China Stock Market.NEWS3: Analysts Forecast 15% Gains Ahead For The Holdings of FNI.NEWS4: Analysts Forecast 15% Gains Ahead For The Holdings of FNI.NEWS5: Oasis Midstream Partners LP (OMP) Ex-Dividend Date Scheduled for May 16, 2018.NEWS6: Oasis Midstream Partners LP (OMP) Ex-Dividend Date Scheduled for May 16, 2018.NEWS7: Black Stone Minerals, L.P. (BSM) Ex-Dividend Date Scheduled for May 16, 2018.NEWS8: Black Stone Minerals, L.P. (BSM) Ex-Dividend Date Scheduled for May 16, 2018.NEWS9: MSCI announces 234 China A shares to be added to indexes.
2018-05-16: NEWS1: China Bourse May Reverse Wednesday's Losses.NEWS2: China Bourse May Reverse Wednesday's Losses.NEWS3: North European Oil Royality Trust (NRT) Ex-Dividend Date Scheduled for May 17, 2018.NEWS4: North European Oil Royality Trust (NRT) Ex-Dividend Date Scheduled for May 17, 2018.NEWS5: Helmerich & Payne, Inc. (HP) Ex-Dividend Date Scheduled for May 17, 2018.NEWS6: Helmerich & Payne, Inc. (HP) Ex-Dividend Date Scheduled for May 17, 2018.
2018-05-17: NEWS1: Losing Streak May Continue For China Stock Market.NEWS2: Losing Streak May Continue For China Stock Market.NEWS3: Chesapeake Granite Wash Trust (CHKR) Ex-Dividend Date Scheduled for May 18, 2018.NEWS4: Chesapeake Granite Wash Trust (CHKR) Ex-Dividend Date Scheduled for May 18, 2018.NEWS5: ECA Marcellus Trust I (ECT) Ex-Dividend Date Scheduled for May 18, 2018.NEWS6: ECA Marcellus Trust I (ECT) Ex-Dividend Date Scheduled for May 18, 2018.NEWS7: Diamondback Energy, Inc. (FANG) Ex-Dividend Date Scheduled for May 18, 2018.NEWS8: Diamondback Energy, Inc. (FANG) Ex-Dividend Date Scheduled for May 18, 2018.
2018-05-18: NEWS1: LNG Remains In Tight Supply In This Key Market.NEWS2: Asian ADRs Move Lower in Friday Trading.NEWS3: Asian ADRs Move Lower in Friday Trading.NEWS4: Sanchez Midstream Partners LP (SNMP) Ex-Dividend Date Scheduled for May 21, 2018.NEWS5: Sanchez Midstream Partners LP (SNMP) Ex-Dividend Date Scheduled for May 21, 2018.NEWS6: ENI S.p.A. (E) Ex-Dividend Date Scheduled for May 21, 2018.NEWS7: ENI S.p.A. (E) Ex-Dividend Date Scheduled for May 21, 2018.

Answer: Decrease