-87.85% is the change from 634 to 77
Calculation steps:
[( 77 - 634 ) ÷ 634] x 100 = -87.85%
Formula
Percentage change = [(77 - 634) / 634] x 100
Subtract the new number by the original number
77 - 634 = -557
-557 ÷ 634 = -0.8785488958990536
-0.8785488958990536 x 100 = -87.85%