-8% is the change from 837 to 770
Calculation steps:
[( 770 - 837 ) ÷ 837] x 100 = -8%
Formula
Percentage change = [(770 - 837) / 837] x 100
Subtract the new number by the original number
770 - 837 = -67
-67 ÷ 837 = -0.08004778972520908
-0.08004778972520908 x 100 = -8%