-86.3% is the change from 971 to 133
Calculation steps:
[( 133 - 971 ) ÷ 971] x 100 = -86.3%
Formula
Percentage change = [(133 - 971) / 971] x 100
Subtract the new number by the original number
133 - 971 = -838
-838 ÷ 971 = -0.86302780638517
-0.86302780638517 x 100 = -86.3%