-71.59% is the change from 521 to 148
Calculation steps:
[( 148 - 521 ) ÷ 521] x 100 = -71.59%
Formula
Percentage change = [(148 - 521) / 521] x 100
Subtract the new number by the original number
148 - 521 = -373
-373 ÷ 521 = -0.7159309021113244
-0.7159309021113244 x 100 = -71.59%