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:PTR, The news for the past five days is as follows:
2018-12-14: NEWS1: PetroChina Reports Hydrocarbon Flow From Tarim Basin Well.
2018-12-17: NEWS1: China Stock Market Expected To Open In The Red.NEWS2: China Stock Market Expected To Open In The Red.
2018-12-18: NEWS1: China Market May Test Resistance At 2,600 Points.NEWS2: China Market May Test Resistance At 2,600 Points.
2018-12-19: NEWS1: China Stock Market May Extend Losing Streak.NEWS2: China Stock Market May Extend Losing Streak.NEWS3: Lower Oil Prices: BP Stock Has Fallen 18% in Q4 2018.
2018-12-20: NEWS1: PetroChina is Now Oversold (PTR).NEWS2: PetroChina is Now Oversold (PTR).NEWS3: Has BP’s Short Interest Risen?.NEWS4: Do Hedge Funds Love PetroChina Company Limited (PTR)?.

Answer: Decrease