-83.18% is the change from 987 to 166
Calculation steps:
[( 166 - 987 ) ÷ 987] x 100 = -83.18%
Formula
Percentage change = [(166 - 987) / 987] x 100
Subtract the new number by the original number
166 - 987 = -821
-821 ÷ 987 = -0.8318135764944276
-0.8318135764944276 x 100 = -83.18%