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:2020-12-21, Stock:PSA, The news for the past five days is as follows:
2020-12-14: NEWS1: Activist Investor Elliott Management Wants Changes at Public Storage.NEWS2: Public Storage Issues Statement.NEWS3: Public Storage Urged to Restructure by Elliott Management.NEWS4: Elliott Management Nominates Independent, Highly Qualified Trustee Candidates to the Board of Public Storage.NEWS5: Public Storage Announces Redemption of All Outstanding Depositary Shares Representing Interests in Its 5.40% Cumulative Preferred Shares, Series B.NEWS6: Public Storage to Host Investor Day May 3, 2021.NEWS7: ADDING and REPLACING Public Storage Appoints Three New Independent Trustees.NEWS8: Elliott Seeks 6 Directors On Public Storage Board After Acquiring Substantial Stake.
2020-12-15: NEWS1: Public Storage (PSA) Notes Key Growth Initiatives, Shares Up 2.6%.
2020-12-16: NEWS1: EQT Is in Talks For Stake in Storable at $2 Billion Value.NEWS2: Is PSA A Good Stock To Buy Now?.
2020-12-17: nan
2020-12-18: nan

Answer: Decrease