-34.37% is the change from 646 to 424
Calculation steps:
[( 424 - 646 ) ÷ 646] x 100 = -34.37%
Formula
Percentage change = [(424 - 646) / 646] x 100
Subtract the new number by the original number
424 - 646 = -222
-222 ÷ 646 = -0.34365325077399383
-0.34365325077399383 x 100 = -34.37%