-99.7% is the change from 1000 to 3
Calculation steps:
[( 3 - 1000 ) ÷ 1000] x 100 = -99.7%
Formula
Percentage change = [(3 - 1000) / 1000] x 100
Subtract the new number by the original number
3 - 1000 = -997
-997 ÷ 1000 = -0.997
-0.997 x 100 = -99.7%