Working backwards (Using figures from Wikipedia, not including loans and guesstimatting at undisclosed fees)
13-14: ~£15.8m (assuming Luna=£2m, Kozak=£6m, Bannan+Makoun=£2m)
12-13: ~£19.5m (Wiki says £22m out, £2.5m in)
11-12: ~(-)£21.75m (assuming L.Young+Hogg=£1m)
10-11: ~£4m (assuming Bent=£18m, Ireland=£8m, Milner=£26m, Makoun=£6m)
09-10: ~£23m (assuming Delph=£6m, Beye=£3m, Warnock=£8m, Knight=£2m)
08-09: ~£44.9m (assuming Davies=£10m, Friedel=£2m, Shorey=£2m, Maloney=£1m, Routledge=£1m)
07-08: ~£4.25m (assuming Harewood=£3m, Salifou=£1m, Davis=£4m, Cahill=£5m, Youngsters=negligible)
06-07: ~£15.6m (assuming Berson=£500k)
Overall: ~£105.3m.
its not the buying the players that was a problem, its the wages of the players