-98% is the change from 851 to 17
Calculation steps:
[( 17 - 851 ) ÷ 851] x 100 = -98%
Formula
Percentage change = [(17 - 851) / 851] x 100
Subtract the new number by the original number
17 - 851 = -834
-834 ÷ 851 = -0.9800235017626322
-0.9800235017626322 x 100 = -98%