-91.81% is the change from 623 to 51
Calculation steps:
[( 51 - 623 ) ÷ 623] x 100 = -91.81%
Formula
Percentage change = [(51 - 623) / 623] x 100
Subtract the new number by the original number
51 - 623 = -572
-572 ÷ 623 = -0.9181380417335474
-0.9181380417335474 x 100 = -91.81%