-96.6% is the change from 999 to 34
Calculation steps:
[( 34 - 999 ) ÷ 999] x 100 = -96.6%
Formula
Percentage change = [(34 - 999) / 999] x 100
Subtract the new number by the original number
34 - 999 = -965
-965 ÷ 999 = -0.965965965965966
-0.965965965965966 x 100 = -96.6%