-2.51% is the change from 837 to 816
Calculation steps:
[( 816 - 837 ) ÷ 837] x 100 = -2.51%
Formula
Percentage change = [(816 - 837) / 837] x 100
Subtract the new number by the original number
816 - 837 = -21
-21 ÷ 837 = -0.025089605734767026
-0.025089605734767026 x 100 = -2.51%