-29.3% is the change from 877 to 620
Calculation steps:
[( 620 - 877 ) ÷ 877] x 100 = -29.3%
Formula
Percentage change = [(620 - 877) / 877] x 100
Subtract the new number by the original number
620 - 877 = -257
-257 ÷ 877 = -0.29304446978335236
-0.29304446978335236 x 100 = -29.3%