-12.39% is the change from 670 to 587
Calculation steps:
[( 587 - 670 ) ÷ 670] x 100 = -12.39%
Formula
Percentage change = [(587 - 670) / 670] x 100
Subtract the new number by the original number
587 - 670 = -83
-83 ÷ 670 = -0.12388059701492538
-0.12388059701492538 x 100 = -12.39%