-31.4% is the change from 968 to 664
Calculation steps:
[( 664 - 968 ) ÷ 968] x 100 = -31.4%
Formula
Percentage change = [(664 - 968) / 968] x 100
Subtract the new number by the original number
664 - 968 = -304
-304 ÷ 968 = -0.3140495867768595
-0.3140495867768595 x 100 = -31.4%
Example