-57.72% is the change from 816 to 345
Calculation steps:
[( 345 - 816 ) ÷ 816] x 100 = -57.72%
Formula
Percentage change = [(345 - 816) / 816] x 100
Subtract the new number by the original number
345 - 816 = -471
-471 ÷ 816 = -0.5772058823529411
-0.5772058823529411 x 100 = -57.72%