Ah, stats, great.
Year of Moyes: We spent the odd £70mill after having won the league, after a season where we had won the league and signed Zaha, Van Persie and Kagawa as first team players. Zaha having his first season under Moyes.
First season of Van Gaal, no CL: £145mill spent on Herrera, Shaw, Rojo, Di Maria and Blind.
Season with CL: The odd £100mill on Depay, Darmian, Schweinsteiger, Anthony Martial (record fee at the time) and Romero on a free.
The total transfer outlay is less, but he pretty much got everything he pointed at, excluding Muller as Bayern were anything but interested in selling him.
Mourinho spent £150mill the first summer, no CL. £146mill the following summer, having qualified for the CL via the Europa League. Breakdown between manager and management becomes clear towards the end of the second season, no trust whatsoever, kept insisting on new players to replace players he had already signed, not happy with his CB's after he had just spent £60mill on lindelof and Bailly. £30mill on Mkhi but instantly replaced him with Sanchez, on obscene wages, who turned out to be even worse. His insistance on getting Depay out of the club on a permanent deal was met by frustration at the club, as we initially wanted to loan him out. We sold him for feck all.
Breaking this down to "we only spend money when we finish outside the top 4" is bizarre. The only time we've gone in to do damage control and limit the manager is after Mourinhos second season, when things started going to shits.
Nor is it hardly a shock that spending tends to increase after managers are replaced.