-67.5% is the change from 957 to 311
Calculation steps:
[( 311 - 957 ) ÷ 957] x 100 = -67.5%
Formula
Percentage change = [(311 - 957) / 957] x 100
Subtract the new number by the original number
311 - 957 = -646
-646 ÷ 957 = -0.6750261233019854
-0.6750261233019854 x 100 = -67.5%