-68.42% is the change from 646 to 204
Calculation steps:
[( 204 - 646 ) ÷ 646] x 100 = -68.42%
Formula
Percentage change = [(204 - 646) / 646] x 100
Subtract the new number by the original number
204 - 646 = -442
-442 ÷ 646 = -0.6842105263157895
-0.6842105263157895 x 100 = -68.42%