-75.22% is the change from 670 to 166
Calculation steps:
[( 166 - 670 ) ÷ 670] x 100 = -75.22%
Formula
Percentage change = [(166 - 670) / 670] x 100
Subtract the new number by the original number
166 - 670 = -504
-504 ÷ 670 = -0.7522388059701492
-0.7522388059701492 x 100 = -75.22%