-19.23% is the change from 78 to 63
Calculation steps:
[( 63 - 78 ) ÷ 78] x 100 = -19.23%
Formula
Percentage change = [(63 - 78) / 78] x 100
Subtract the new number by the original number
63 - 78 = -15
-15 ÷ 78 = -0.19230769230769232
-0.19230769230769232 x 100 = -19.23%