-18.66% is the change from 670 to 545
Calculation steps:
[( 545 - 670 ) ÷ 670] x 100 = -18.66%
Formula
Percentage change = [(545 - 670) / 670] x 100
Subtract the new number by the original number
545 - 670 = -125
-125 ÷ 670 = -0.1865671641791045
-0.1865671641791045 x 100 = -18.66%