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:2019-05-20, Stock:RIO, The news for the past five days is as follows:
2019-05-13: nan
2019-05-14: NEWS1: Over 40% of minority shareholders of Turquoise Hill oppose independent directors.NEWS2: Rio-controlled Turquoise Hill suffers investor revolt.NEWS3: Norsk Hydro looks to master magnetism to keep carbon promise.NEWS4: FOCUS-Norsk Hydro looks to master magnetism to keep carbon promise.
2019-05-15: NEWS1: Pressure builds on Turquoise Hill after investor revolt.NEWS2: What Are Analysts Saying About Rio Tinto Group's (LON:RIO) Future?.
2019-05-16: NEWS1: Huawei fails to rattle European markets.NEWS2: A New Diamond-Mining Boat Will Hoover Up Gems Off Namibia’s Coast.
2019-05-17: NEWS1: Why Iron Ore Prices Could Have More Upside after Breaching $100.NEWS2: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for May 20, 2019.NEWS3: Pan American Silver Corp. (PAAS) Ex-Dividend Date Scheduled for May 20, 2019.

Answer: Decrease