-51.55% is the change from 161 to 78
Calculation steps:
[( 78 - 161 ) ÷ 161] x 100 = -51.55%
Formula
Percentage change = [(78 - 161) / 161] x 100
Subtract the new number by the original number
78 - 161 = -83
-83 ÷ 161 = -0.515527950310559
-0.515527950310559 x 100 = -51.55%