-66.4% is the change from 500 to 168
Calculation steps:
[( 168 - 500 ) ÷ 500] x 100 = -66.4%
Formula
Percentage change = [(168 - 500) / 500] x 100
Subtract the new number by the original number
168 - 500 = -332
-332 ÷ 500 = -0.664
-0.664 x 100 = -66.4%