-37.59% is the change from 266 to 166
Calculation steps:
[( 166 - 266 ) ÷ 266] x 100 = -37.59%
Formula
Percentage change = [(166 - 266) / 266] x 100
Subtract the new number by the original number
166 - 266 = -100
-100 ÷ 266 = -0.37593984962406013
-0.37593984962406013 x 100 = -37.59%