-15.83% is the change from 619 to 521
Calculation steps:
[( 521 - 619 ) ÷ 619] x 100 = -15.83%
Formula
Percentage change = [(521 - 619) / 619] x 100
Subtract the new number by the original number
521 - 619 = -98
-98 ÷ 619 = -0.1583198707592892
-0.1583198707592892 x 100 = -15.83%