-34.67% is the change from 646 to 422
Calculation steps:
[( 422 - 646 ) ÷ 646] x 100 = -34.67%
Formula
Percentage change = [(422 - 646) / 646] x 100
Subtract the new number by the original number
422 - 646 = -224
-224 ÷ 646 = -0.34674922600619196
-0.34674922600619196 x 100 = -34.67%