-66.36% is the change from 642 to 216
Calculation steps:
[( 216 - 642 ) ÷ 642] x 100 = -66.36%
Formula
Percentage change = [(216 - 642) / 642] x 100
Subtract the new number by the original number
216 - 642 = -426
-426 ÷ 642 = -0.6635514018691588
-0.6635514018691588 x 100 = -66.36%