-45.34% is the change from 311 to 170
Calculation steps:
[( 170 - 311 ) ÷ 311] x 100 = -45.34%
Formula
Percentage change = [(170 - 311) / 311] x 100
Subtract the new number by the original number
170 - 311 = -141
-141 ÷ 311 = -0.4533762057877814
-0.4533762057877814 x 100 = -45.34%