-77.09% is the change from 646 to 148
Calculation steps:
[( 148 - 646 ) ÷ 646] x 100 = -77.09%
Formula
Percentage change = [(148 - 646) / 646] x 100
Subtract the new number by the original number
148 - 646 = -498
-498 ÷ 646 = -0.7708978328173375
-0.7708978328173375 x 100 = -77.09%