-70.59% is the change from 646 to 190
Calculation steps:
[( 190 - 646 ) ÷ 646] x 100 = -70.59%
Formula
Percentage change = [(190 - 646) / 646] x 100
Subtract the new number by the original number
190 - 646 = -456
-456 ÷ 646 = -0.7058823529411765
-0.7058823529411765 x 100 = -70.59%