-49.71% is the change from 686 to 345
Calculation steps:
[( 345 - 686 ) ÷ 686] x 100 = -49.71%
Formula
Percentage change = [(345 - 686) / 686] x 100
Subtract the new number by the original number
345 - 686 = -341
-341 ÷ 686 = -0.4970845481049563
-0.4970845481049563 x 100 = -49.71%