-75.97% is the change from 670 to 161
Calculation steps:
[( 161 - 670 ) ÷ 670] x 100 = -75.97%
Formula
Percentage change = [(161 - 670) / 670] x 100
Subtract the new number by the original number
161 - 670 = -509
-509 ÷ 670 = -0.7597014925373134
-0.7597014925373134 x 100 = -75.97%