-21.79% is the change from 670 to 524
Calculation steps:
[( 524 - 670 ) ÷ 670] x 100 = -21.79%
Formula
Percentage change = [(524 - 670) / 670] x 100
Subtract the new number by the original number
524 - 670 = -146
-146 ÷ 670 = -0.21791044776119403
-0.21791044776119403 x 100 = -21.79%