-66.25% is the change from 646 to 218
Calculation steps:
[( 218 - 646 ) ÷ 646] x 100 = -66.25%
Formula
Percentage change = [(218 - 646) / 646] x 100
Subtract the new number by the original number
218 - 646 = -428
-428 ÷ 646 = -0.6625386996904025
-0.6625386996904025 x 100 = -66.25%