-67.1% is the change from 155 to 51
Calculation steps:
[( 51 - 155 ) ÷ 155] x 100 = -67.1%
Formula
Percentage change = [(51 - 155) / 155] x 100
Subtract the new number by the original number
51 - 155 = -104
-104 ÷ 155 = -0.6709677419354839
-0.6709677419354839 x 100 = -67.1%