-65.6% is the change from 997 to 343
Calculation steps:
[( 343 - 997 ) ÷ 997] x 100 = -65.6%
Formula
Percentage change = [(343 - 997) / 997] x 100
Subtract the new number by the original number
343 - 997 = -654
-654 ÷ 997 = -0.6559679037111334
-0.6559679037111334 x 100 = -65.6%