-72.19% is the change from 597 to 166
Calculation steps:
[( 166 - 597 ) ÷ 597] x 100 = -72.19%
Formula
Percentage change = [(166 - 597) / 597] x 100
Subtract the new number by the original number
166 - 597 = -431
-431 ÷ 597 = -0.7219430485762144
-0.7219430485762144 x 100 = -72.19%