-6.47% is the change from 819 to 766
Calculation steps:
[( 766 - 819 ) ÷ 819] x 100 = -6.47%
Formula
Percentage change = [(766 - 819) / 819] x 100
Subtract the new number by the original number
766 - 819 = -53
-53 ÷ 819 = -0.06471306471306472
-0.06471306471306472 x 100 = -6.47%