-6.6% is the change from 303 to 283
Calculation steps:
[( 283 - 303 ) ÷ 303] x 100 = -6.6%
Formula
Percentage change = [(283 - 303) / 303] x 100
Subtract the new number by the original number
283 - 303 = -20
-20 ÷ 303 = -0.066006600660066
-0.066006600660066 x 100 = -6.6%