-57.05% is the change from 645 to 277
Calculation steps:
[( 277 - 645 ) ÷ 645] x 100 = -57.05%
Formula
Percentage change = [(277 - 645) / 645] x 100
Subtract the new number by the original number
277 - 645 = -368
-368 ÷ 645 = -0.5705426356589147
-0.5705426356589147 x 100 = -57.05%