-21.19% is the change from 670 to 528
Calculation steps:
[( 528 - 670 ) ÷ 670] x 100 = -21.19%
Formula
Percentage change = [(528 - 670) / 670] x 100
Subtract the new number by the original number
528 - 670 = -142
-142 ÷ 670 = -0.21194029850746268
-0.21194029850746268 x 100 = -21.19%