-66.09% is the change from 917 to 311
Calculation steps:
[( 311 - 917 ) ÷ 917] x 100 = -66.09%
Formula
Percentage change = [(311 - 917) / 917] x 100
Subtract the new number by the original number
311 - 917 = -606
-606 ÷ 917 = -0.6608505997818975
-0.6608505997818975 x 100 = -66.09%