-68.1% is the change from 975 to 311
Calculation steps:
[( 311 - 975 ) ÷ 975] x 100 = -68.1%
Formula
Percentage change = [(311 - 975) / 975] x 100
Subtract the new number by the original number
311 - 975 = -664
-664 ÷ 975 = -0.681025641025641
-0.681025641025641 x 100 = -68.1%