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:BBL, The news for the past five days is as follows:
2019-12-11: nan
2019-12-12: NEWS1: BHP puts four industry groups on notice after climate policy review.
2019-12-13: nan
2019-12-16: NEWS1: Petra Diamonds US$ Treasury Plc -- Moody's downgrades Petra Diamonds' CFR to Caa1; stable outlook.
2019-12-17: NEWS1: Petra Diamonds US$ Treasury Plc -- Moody's announces completion of a periodic review of ratings of Petra Diamonds Limited.

Answer: Decrease