-17.62% is the change from 806 to 664
Calculation steps:
[( 664 - 806 ) ÷ 806] x 100 = -17.62%
Formula
Percentage change = [(664 - 806) / 806] x 100
Subtract the new number by the original number
664 - 806 = -142
-142 ÷ 806 = -0.1761786600496278
-0.1761786600496278 x 100 = -17.62%