-66.41% is the change from 646 to 217
Calculation steps:
[( 217 - 646 ) ÷ 646] x 100 = -66.41%
Formula
Percentage change = [(217 - 646) / 646] x 100
Subtract the new number by the original number
217 - 646 = -429
-429 ÷ 646 = -0.6640866873065016
-0.6640866873065016 x 100 = -66.41%