-83.63% is the change from 623 to 102
Calculation steps:
[( 102 - 623 ) ÷ 623] x 100 = -83.63%
Formula
Percentage change = [(102 - 623) / 623] x 100
Subtract the new number by the original number
102 - 623 = -521
-521 ÷ 623 = -0.8362760834670947
-0.8362760834670947 x 100 = -83.63%