-70.9% is the change from 646 to 188
Calculation steps:
[( 188 - 646 ) ÷ 646] x 100 = -70.9%
Formula
Percentage change = [(188 - 646) / 646] x 100
Subtract the new number by the original number
188 - 646 = -458
-458 ÷ 646 = -0.7089783281733746
-0.7089783281733746 x 100 = -70.9%