-37.88% is the change from 520 to 323
Calculation steps:
[( 323 - 520 ) ÷ 520] x 100 = -37.88%
Formula
Percentage change = [(323 - 520) / 520] x 100
Subtract the new number by the original number
323 - 520 = -197
-197 ÷ 520 = -0.37884615384615383
-0.37884615384615383 x 100 = -37.88%