-66.55% is the change from 837 to 280
Calculation steps:
[( 280 - 837 ) ÷ 837] x 100 = -66.55%
Formula
Percentage change = [(280 - 837) / 837] x 100
Subtract the new number by the original number
280 - 837 = -557
-557 ÷ 837 = -0.6654719235364397
-0.6654719235364397 x 100 = -66.55%