-67.34% is the change from 646 to 211
Calculation steps:
[( 211 - 646 ) ÷ 646] x 100 = -67.34%
Formula
Percentage change = [(211 - 646) / 646] x 100
Subtract the new number by the original number
211 - 646 = -435
-435 ÷ 646 = -0.673374613003096
-0.673374613003096 x 100 = -67.34%