Hi echoes,
I am not sure which numbers to post - so, I will just write all the numbers opposite the FEV1. Here they are:

2008
Ref : 2.77
Pre : 2.56
Pre% : 93
Post : 2.63
Post% : 95
%Change: 3

2011
Ref : 2.63
Pre : 2.00
Pre% : 71
Post : 1.93
Post% : 68
%Change: -4

2012
Ref : 2.79
Pre : 1.66
Pre% : 59
Post : 1.76
Post% : 63
%Change : 6

I hope you could provide me with more enlightenment on these numbers.

Thank you in advance.