-79.26% is the change from 646 to 134
Calculation steps:
[( 134 - 646 ) ÷ 646] x 100 = -79.26%
Formula
Percentage change = [(134 - 646) / 646] x 100
Subtract the new number by the original number
134 - 646 = -512
-512 ÷ 646 = -0.7925696594427245
-0.7925696594427245 x 100 = -79.26%