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:2021-05-21, Stock:RIO, The news for the past five days is as follows:
2021-05-14: NEWS1: BHP Group (BHP) Rides on High Iron Prices Amid High Costs.
2021-05-17: NEWS1: Mining Stocks Gleam As Copper, The Red Metal, Becomes The 'Green Metal'.NEWS2: Why Western Copper and Gold Stock Rallied 20% in Early Trading Today.NEWS3: Is WisdomTree International Hedged Quality Dividend Growth ETF (IHDG) a Strong ETF Right Now?.
2021-05-18: NEWS1: Shareholders of Rio Tinto Group (LON:RIO) Must Be Delighted With Their 356% Total Return.
2021-05-19: NEWS1: 10 Best ASX Stocks to Buy Now.NEWS2: U.K. stocks drop as consumer prices surge and commodities tumble.NEWS3: Top Mining Companies in the World.
2021-05-20: nan

Answer: Decrease