[Data: BTC has been declining for 2 consecutive months, the last time BTC showed a full Q4 decline was in 2018] According to data shared by Crypto Rover, BTC fell 3.69% in October, 17.67% in November, and 4.76% on the first day of December. Notably, the last time Bitcoin showed an all-red performance throughout the fourth quarter (i.e., negative returns every month) was in 2018.