-66.2% is the change from 642 to 217
Calculation steps:
[( 217 - 642 ) ÷ 642] x 100 = -66.2%
Formula
Percentage change = [(217 - 642) / 642] x 100
Subtract the new number by the original number
217 - 642 = -425
-425 ÷ 642 = -0.661993769470405
-0.661993769470405 x 100 = -66.2%