-68.45% is the change from 970 to 306
Calculation steps:
[( 306 - 970 ) ÷ 970] x 100 = -68.45%
Formula
Percentage change = [(306 - 970) / 970] x 100
Subtract the new number by the original number
306 - 970 = -664
-664 ÷ 970 = -0.6845360824742268
-0.6845360824742268 x 100 = -68.45%