-68.18% is the change from 971 to 309
Calculation steps:
[( 309 - 971 ) ÷ 971] x 100 = -68.18%
Formula
Percentage change = [(309 - 971) / 971] x 100
Subtract the new number by the original number
309 - 971 = -662
-662 ÷ 971 = -0.6817713697219362
-0.6817713697219362 x 100 = -68.18%