-19.85% is the change from 680 to 545
Calculation steps:
[( 545 - 680 ) ÷ 680] x 100 = -19.85%
Formula
Percentage change = [(545 - 680) / 680] x 100
Subtract the new number by the original number
545 - 680 = -135
-135 ÷ 680 = -0.19852941176470587
-0.19852941176470587 x 100 = -19.85%