-67.18% is the change from 646 to 212
Calculation steps:
[( 212 - 646 ) ÷ 646] x 100 = -67.18%
Formula
Percentage change = [(212 - 646) / 646] x 100
Subtract the new number by the original number
212 - 646 = -434
-434 ÷ 646 = -0.6718266253869969
-0.6718266253869969 x 100 = -67.18%