-86.8% is the change from 977 to 129
Calculation steps:
[( 129 - 977 ) ÷ 977] x 100 = -86.8%
Formula
Percentage change = [(129 - 977) / 977] x 100
Subtract the new number by the original number
129 - 977 = -848
-848 ÷ 977 = -0.8679631525076765
-0.8679631525076765 x 100 = -86.8%