-7.07% is the change from 877 to 815
Calculation steps:
[( 815 - 877 ) ÷ 877] x 100 = -7.07%
Formula
Percentage change = [(815 - 877) / 877] x 100
Subtract the new number by the original number
815 - 877 = -62
-62 ÷ 877 = -0.07069555302166476
-0.07069555302166476 x 100 = -7.07%