-68.32% is the change from 161 to 51
Calculation steps:
[( 51 - 161 ) ÷ 161] x 100 = -68.32%
Formula
Percentage change = [(51 - 161) / 161] x 100
Subtract the new number by the original number
51 - 161 = -110
-110 ÷ 161 = -0.6832298136645962
-0.6832298136645962 x 100 = -68.32%