-0.23% is the change from 852 to 850
Calculation steps:
[( 850 - 852 ) ÷ 852] x 100 = -0.23%
Formula
Percentage change = [(850 - 852) / 852] x 100
Subtract the new number by the original number
850 - 852 = -2
-2 ÷ 852 = -0.002347417840375587
-0.002347417840375587 x 100 = -0.23%