-75.85% is the change from 646 to 156
Calculation steps:
[( 156 - 646 ) ÷ 646] x 100 = -75.85%
Formula
Percentage change = [(156 - 646) / 646] x 100
Subtract the new number by the original number
156 - 646 = -490
-490 ÷ 646 = -0.7585139318885449
-0.7585139318885449 x 100 = -75.85%