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:2018-08-21, Stock:PTR, The news for the past five days is as follows:
2018-08-14: NEWS1: China Stock Market May Stop The Bleeding On Wednesday.NEWS2: China Stock Market May Stop The Bleeding On Wednesday.NEWS3: Oasis Midstream Partners LP (OMP) Ex-Dividend Date Scheduled for August 15, 2018.NEWS4: Oasis Midstream Partners LP (OMP) Ex-Dividend Date Scheduled for August 15, 2018.NEWS5: Seadrill Partners LLC (SDLP) Ex-Dividend Date Scheduled for August 15, 2018.NEWS6: Seadrill Partners LLC (SDLP) Ex-Dividend Date Scheduled for August 15, 2018.NEWS7: Black Stone Minerals, L.P. (BSM) Ex-Dividend Date Scheduled for August 15, 2018.NEWS8: Black Stone Minerals, L.P. (BSM) Ex-Dividend Date Scheduled for August 15, 2018.NEWS9: Exclusive - China's Sinochem to transfer WEPEC refinery stake to PetroChina, seeks trader role: sources.
2018-08-15: NEWS1: Oil & Gas - International Integrated Outlook: Prospects Bleak.NEWS2: Oil & Gas - International Integrated Outlook: Prospects Bleak.NEWS3: Soft Start Tipped For China Stock Market.NEWS4: Soft Start Tipped For China Stock Market.NEWS5: Helmerich & Payne, Inc. (HP) Ex-Dividend Date Scheduled for August 16, 2018.NEWS6: Helmerich & Payne, Inc. (HP) Ex-Dividend Date Scheduled for August 16, 2018.NEWS7: North European Oil Royality Trust (NRT) Ex-Dividend Date Scheduled for August 16, 2018.NEWS8: North European Oil Royality Trust (NRT) Ex-Dividend Date Scheduled for August 16, 2018.
2018-08-16: NEWS1: China Shares May Stop The Bleeding On Friday.NEWS2: China Shares May Stop The Bleeding On Friday.NEWS3: Chesapeake Granite Wash Trust (CHKR) Ex-Dividend Date Scheduled for August 17, 2018.NEWS4: Chesapeake Granite Wash Trust (CHKR) Ex-Dividend Date Scheduled for August 17, 2018.NEWS5: Diamondback Energy, Inc. (FANG) Ex-Dividend Date Scheduled for August 17, 2018.NEWS6: Diamondback Energy, Inc. (FANG) Ex-Dividend Date Scheduled for August 17, 2018.
2018-08-17: NEWS1: ECA Marcellus Trust I (ECT) Ex-Dividend Date Scheduled for August 20, 2018.NEWS2: ECA Marcellus Trust I (ECT) Ex-Dividend Date Scheduled for August 20, 2018.NEWS3: Sanchez Midstream Partners LP (SNMP) Ex-Dividend Date Scheduled for August 20, 2018.NEWS4: Sanchez Midstream Partners LP (SNMP) Ex-Dividend Date Scheduled for August 20, 2018.NEWS5: BP Stock: Analysts Are Mostly on the Fence.
2018-08-20: NEWS1: China Bourse May See Continued Support On Tuesday.NEWS2: China Bourse May See Continued Support On Tuesday.NEWS3: ExxonMobil (XOM) Executes SPA for PNG LNG Project With BP.

Answer: Decrease