-64.4% is the change from 646 to 230
Calculation steps:
[( 230 - 646 ) ÷ 646] x 100 = -64.4%
Formula
Percentage change = [(230 - 646) / 646] x 100
Subtract the new number by the original number
230 - 646 = -416
-416 ÷ 646 = -0.6439628482972136
-0.6439628482972136 x 100 = -64.4%