-66.04% is the change from 642 to 218
Calculation steps:
[( 218 - 642 ) ÷ 642] x 100 = -66.04%
Formula
Percentage change = [(218 - 642) / 642] x 100
Subtract the new number by the original number
218 - 642 = -424
-424 ÷ 642 = -0.660436137071651
-0.660436137071651 x 100 = -66.04%