-77.4% is the change from 646 to 146
Calculation steps:
[( 146 - 646 ) ÷ 646] x 100 = -77.4%
Formula
Percentage change = [(146 - 646) / 646] x 100
Subtract the new number by the original number
146 - 646 = -500
-500 ÷ 646 = -0.7739938080495357
-0.7739938080495357 x 100 = -77.4%