The collapse of the financial services sector in UK, Europe, and US in late 2007 had a knock on effect on IT recruiting. It has taken 4 years to recover.
The big question now, is, whether it will last.
Financial regulation, certainly in the UK, is on the increase. Ringfencing of retail banking from investment banking risk in particular.
The UK banks are saying it will take 5 years to implement.
Linux is particularly strong in the financial sector, so I hope to be able to look back on that graph again in a year or so, and see the levels staying broadly the same / slight rise.