-99.7% is the change from 337 to 1
Calculation steps:
[( 1 - 337 ) ÷ 337] x 100 = -99.7%
Formula
Percentage change = [(1 - 337) / 337] x 100
Subtract the new number by the original number
1 - 337 = -336
-336 ÷ 337 = -0.9970326409495549
-0.9970326409495549 x 100 = -99.7%