-65.73% is the change from 642 to 220
Calculation steps:
[( 220 - 642 ) ÷ 642] x 100 = -65.73%
Formula
Percentage change = [(220 - 642) / 642] x 100
Subtract the new number by the original number
220 - 642 = -422
-422 ÷ 642 = -0.6573208722741433
-0.6573208722741433 x 100 = -65.73%