-97.75% is the change from 934 to 21
Calculation steps:
[( 21 - 934 ) ÷ 934] x 100 = -97.75%
Formula
Percentage change = [(21 - 934) / 934] x 100
Subtract the new number by the original number
21 - 934 = -913
-913 ÷ 934 = -0.9775160599571735
-0.9775160599571735 x 100 = -97.75%