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:2018-04-20, Stock:NGG, The news for the past five days is as follows:
2018-04-13: nan
2018-04-16: nan
2018-04-17: NEWS1: Ormat's Unit to Build 40MW Storage, Increase Grid Resilience.NEWS2: Ormat's Unit to Build 40MW Storage, Increase Grid Resilience.NEWS3: Research Report Identifies Copa Holdings, S.A, Rayonier Advanced Materials, Royal Dutch Shell, Trupanion, DAQO New Energy, and National Grid Transco with Renewed Outlook — Fundamental Analysis, Calculating Forward Movement.
2018-04-18: nan
2018-04-19: nan

Answer: Decrease