-74.18% is the change from 670 to 173
Calculation steps:
[( 173 - 670 ) ÷ 670] x 100 = -74.18%
Formula
Percentage change = [(173 - 670) / 670] x 100
Subtract the new number by the original number
173 - 670 = -497
-497 ÷ 670 = -0.7417910447761195
-0.7417910447761195 x 100 = -74.18%