-20.18% is the change from 778 to 621
Calculation steps:
[( 621 - 778 ) ÷ 778] x 100 = -20.18%
Formula
Percentage change = [(621 - 778) / 778] x 100
Subtract the new number by the original number
621 - 778 = -157
-157 ÷ 778 = -0.20179948586118251
-0.20179948586118251 x 100 = -20.18%