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:2019-12-18, Stock:RIO, The news for the past five days is as follows:
2019-12-11: NEWS1: Wall Street Is Finally Getting Bullish About Mining. Here Are 2 Stocks to Buy..NEWS2: Gold’s Deal Blitz Could Draw In the Rest of the Mining Sector.NEWS3: Copper at 4-1/2-Month High on Solid Imports Data From China.NEWS4: Rio Tinto Notes Mongolian Parliament Resolution on Oyu Tolgoi.NEWS5: First Quantum Says No Takeover Bid from Rio Tinto or Jiangxi.
2019-12-12: nan
2019-12-13: NEWS1: Rio Tinto Offers Responsibly Produced Aluminium From Pacific Operations.
2019-12-16: nan
2019-12-17: nan

Answer: Decrease