-1.6% is the change from 815 to 802
Calculation steps:
[( 802 - 815 ) ÷ 815] x 100 = -1.6%
Formula
Percentage change = [(802 - 815) / 815] x 100
Subtract the new number by the original number
802 - 815 = -13
-13 ÷ 815 = -0.015950920245398775
-0.015950920245398775 x 100 = -1.6%