-21.18% is the change from 845 to 666
Calculation steps:
[( 666 - 845 ) ÷ 845] x 100 = -21.18%
Formula
Percentage change = [(666 - 845) / 845] x 100
Subtract the new number by the original number
666 - 845 = -179
-179 ÷ 845 = -0.2118343195266272
-0.2118343195266272 x 100 = -21.18%