-33.75% is the change from 646 to 428
Calculation steps:
[( 428 - 646 ) ÷ 646] x 100 = -33.75%
Formula
Percentage change = [(428 - 646) / 646] x 100
Subtract the new number by the original number
428 - 646 = -218
-218 ÷ 646 = -0.33746130030959753
-0.33746130030959753 x 100 = -33.75%