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:2018-12-21, Stock:VALE, The news for the past five days is as follows:
2018-12-14: NEWS1: Royal Gold Bets on New Mines, Buyouts, Low Gold Prices Hurt.NEWS2: Royal Gold Bets on New Mines, Buyouts, Low Gold Prices Hurt.NEWS3: Royal Gold Bets on New Mines, Buyouts, Low Gold Prices Hurt.NEWS4: Why China Needs More Than a Trade War Truce to Buck the Slowdown.
2018-12-17: nan
2018-12-18: NEWS1: Why Should You Add Mosaic (MOS) Stock to Your Portfolio?.NEWS2: Why Should You Add Mosaic (MOS) Stock to Your Portfolio?.NEWS3: Why Should You Add Mosaic (MOS) Stock to Your Portfolio?.
2018-12-19: NEWS1: Copper Throws Mixed Signals for Markets.NEWS2: Mining Stocks Look Dead unless China Stabilizes.NEWS3: Is Freeport-McMoRan Worth a Look Now?.
2018-12-20: nan

Answer: Decrease