-37.1% is the change from 310 to 195
Calculation steps:
[( 195 - 310 ) ÷ 310] x 100 = -37.1%
Formula
Percentage change = [(195 - 310) / 310] x 100
Subtract the new number by the original number
195 - 310 = -115
-115 ÷ 310 = -0.3709677419354839
-0.3709677419354839 x 100 = -37.1%