-16.37% is the change from 623 to 521
Calculation steps:
[( 521 - 623 ) ÷ 623] x 100 = -16.37%
Formula
Percentage change = [(521 - 623) / 623] x 100
Subtract the new number by the original number
521 - 623 = -102
-102 ÷ 623 = -0.1637239165329053
-0.1637239165329053 x 100 = -16.37%