-33.44% is the change from 643 to 428
Calculation steps:
[( 428 - 643 ) ÷ 643] x 100 = -33.44%
Formula
Percentage change = [(428 - 643) / 643] x 100
Subtract the new number by the original number
428 - 643 = -215
-215 ÷ 643 = -0.3343701399688958
-0.3343701399688958 x 100 = -33.44%