-3.7% is the change from 811 to 781
Calculation steps:
[( 781 - 811 ) ÷ 811] x 100 = -3.7%
Formula
Percentage change = [(781 - 811) / 811] x 100
Subtract the new number by the original number
781 - 811 = -30
-30 ÷ 811 = -0.036991368680641186
-0.036991368680641186 x 100 = -3.7%