-3.87% is the change from 853 to 820
Calculation steps:
[( 820 - 853 ) ÷ 853] x 100 = -3.87%
Formula
Percentage change = [(820 - 853) / 853] x 100
Subtract the new number by the original number
820 - 853 = -33
-33 ÷ 853 = -0.038686987104337635
-0.038686987104337635 x 100 = -3.87%