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:2020-08-21, Stock:NGG, The news for the past five days is as follows:
2020-08-14: NEWS1: National Grid Electricity System Operator Ltd -- Moody's changes outlook on National Grid plc and most subsidiaries to negative; affirms ratings.
2020-08-17: nan
2020-08-18: nan
2020-08-19: nan
2020-08-20: NEWS1: Should You Be Worried About National Grid plc's (LON:NG.) 6.5% Return On Equity?.

Answer: Decrease