-63.34% is the change from 521 to 191
Calculation steps:
[( 191 - 521 ) ÷ 521] x 100 = -63.34%
Formula
Percentage change = [(191 - 521) / 521] x 100
Subtract the new number by the original number
191 - 521 = -330
-330 ÷ 521 = -0.6333973128598849
-0.6333973128598849 x 100 = -63.34%