-23.2% is the change from 668 to 513
Calculation steps:
[( 513 - 668 ) ÷ 668] x 100 = -23.2%
Formula
Percentage change = [(513 - 668) / 668] x 100
Subtract the new number by the original number
513 - 668 = -155
-155 ÷ 668 = -0.23203592814371257
-0.23203592814371257 x 100 = -23.2%