-52.02% is the change from 667 to 320
Calculation steps:
[( 320 - 667 ) ÷ 667] x 100 = -52.02%
Formula
Percentage change = [(320 - 667) / 667] x 100
Subtract the new number by the original number
320 - 667 = -347
-347 ÷ 667 = -0.52023988005997
-0.52023988005997 x 100 = -52.02%