What's happening with the Linnets?

So far this year I have recorded only 2 Linnet from my vismig point at Inverkeithing. I should have been seeing them all month. Last autumn the numbers were way down on 2011, as the charts below show. No sign of returning breeding Linnets on either Culloe or Hill of Beath, although that may not be a surprise yet. But something's not quite right here.

Going back further, trek totals for Linnet 1-15th March:

2013 (6)
2012 (600)
2011 (13800)
2010 (19100)

October-November 2011

October-November 2012

March 1-14, 2012

March 1-14, 2013 - 6 birds!!!

Birdtrack chart - % of complete lists featuring Linnet

Bizarrely the Birdtrack chart for Linnet also looks remarkably like the boa digesting an elephant from The Little Prince