-14.78% is the change from 670 to 571
Calculation steps:
[( 571 - 670 ) ÷ 670] x 100 = -14.78%
Formula
Percentage change = [(571 - 670) / 670] x 100
Subtract the new number by the original number
571 - 670 = -99
-99 ÷ 670 = -0.14776119402985075
-0.14776119402985075 x 100 = -14.78%