-61.3% is the change from 646 to 250
Calculation steps:
[( 250 - 646 ) ÷ 646] x 100 = -61.3%
Formula
Percentage change = [(250 - 646) / 646] x 100
Subtract the new number by the original number
250 - 646 = -396
-396 ÷ 646 = -0.6130030959752322
-0.6130030959752322 x 100 = -61.3%