-66.56% is the change from 646 to 216
Calculation steps:
[( 216 - 646 ) ÷ 646] x 100 = -66.56%
Formula
Percentage change = [(216 - 646) / 646] x 100
Subtract the new number by the original number
216 - 646 = -430
-430 ÷ 646 = -0.6656346749226006
-0.6656346749226006 x 100 = -66.56%