-71.4% is the change from 521 to 149
Calculation steps:
[( 149 - 521 ) ÷ 521] x 100 = -71.4%
Formula
Percentage change = [(149 - 521) / 521] x 100
Subtract the new number by the original number
149 - 521 = -372
-372 ÷ 521 = -0.7140115163147792
-0.7140115163147792 x 100 = -71.4%