-65.5% is the change from 1000 to 345
Calculation steps:
[( 345 - 1000 ) ÷ 1000] x 100 = -65.5%
Formula
Percentage change = [(345 - 1000) / 1000] x 100
Subtract the new number by the original number
345 - 1000 = -655
-655 ÷ 1000 = -0.655
-0.655 x 100 = -65.5%