-34.52% is the change from 646 to 423
Calculation steps:
[( 423 - 646 ) ÷ 646] x 100 = -34.52%
Formula
Percentage change = [(423 - 646) / 646] x 100
Subtract the new number by the original number
423 - 646 = -223
-223 ÷ 646 = -0.34520123839009287
-0.34520123839009287 x 100 = -34.52%