It means that the index attained the value of 54 points in 2009.
The consumer confidence index was started in 1967 and is benchmarked to 1985=100
Can you understand it better now?
What I don't understand is that it is negative -, different to positive +:
In the below, +33 should have meant that the index attained the value of 33 points, which seems to mean 33 above zero point.
Thus I guess that -54 would mean 54 below zero point, which is not understood by me and is why I got confused.
This U.S. Job Creation Index stood at -3 in January 2009, and by December 2016 it had improved to +33.