-99% is the change from 996 to 10
Calculation steps:
[( 10 - 996 ) ÷ 996] x 100 = -99%
Formula
Percentage change = [(10 - 996) / 996] x 100
Subtract the new number by the original number
10 - 996 = -986
-986 ÷ 996 = -0.9899598393574297
-0.9899598393574297 x 100 = -99%