-99.8% is the change from 495 to 1
Calculation steps:
[( 1 - 495 ) ÷ 495] x 100 = -99.8%
Formula
Percentage change = [(1 - 495) / 495] x 100
Subtract the new number by the original number
1 - 495 = -494
-494 ÷ 495 = -0.997979797979798
-0.997979797979798 x 100 = -99.8%