-14.73% is the change from 611 to 521
Calculation steps:
[( 521 - 611 ) ÷ 611] x 100 = -14.73%
Formula
Percentage change = [(521 - 611) / 611] x 100
Subtract the new number by the original number
521 - 611 = -90
-90 ÷ 611 = -0.14729950900163666
-0.14729950900163666 x 100 = -14.73%