-25.2% is the change from 861 to 644
Calculation steps:
[( 644 - 861 ) ÷ 861] x 100 = -25.2%
Formula
Percentage change = [(644 - 861) / 861] x 100
Subtract the new number by the original number
644 - 861 = -217
-217 ÷ 861 = -0.25203252032520324
-0.25203252032520324 x 100 = -25.2%