F1 2014 F1 2014 tyres

[ste88r]

Hi,
I am playing with f1 2014 (ps3)
I forgot how to read the wear of the tyres.

I attached a photo (sorry for the Italian)
My questions are:
What is it the number up and the number down? I mean 1.8laps and 16.2laps
16.2 laps I suppose the life of the set tyre but 1.8?

Thanks a lot