-16.8% is the change from 649 to 540
Calculation steps:
[( 540 - 649 ) ÷ 649] x 100 = -16.8%
Formula
Percentage change = [(540 - 649) / 649] x 100
Subtract the new number by the original number
540 - 649 = -109
-109 ÷ 649 = -0.1679506933744222
-0.1679506933744222 x 100 = -16.8%