This is the one stat that has every Wall Street banker depressed

Mergers and acquisitions, or M&A, deals have been falling apart lately — and it's starting to seriously hurt Wall Street.
Wall Street banks have lost $1.2 billion in revenue this year because of withdrawn global M&A, according to Dealogic.
That's up 33% from the same period last year — and at its highest level since 2007.
Lost revenue from megadeals, or deals worth at least $10 billion, makes up 65% of the total withdrawn M&A revenue this year. In 2007, megadeals made up