Wall Street dealmakers are crushing it in this one area

One industry - and one industry alone - has been good to Wall Street dealmakers this year.

Investment banks have made $7.6 billion so far this year advising healthcare companies on equity and debt deals and takeovers, according to Dealogic.

That is the highest level on record and up 35% on the same period in 2014.

Total investment banking revenues across all sectors are down 11%, in contrast, at around $54.5 billion.

Every other industrial sector outside the healthcare sector has seen a drop in fees.

So why are healthcare bankers killing it right now?

Mostly because of M&A activity.

Healthcare M&A has earned banks a record total of $2.8 billion in revenue so far this year, up 51% from the same period last year, according to the data.

Equity capital markets revenue is not far behind, at $2.5 year to date, while debt capital markets revenue is $1.3 billion.

We're not surprised.

As Business Insider reported earlier this year, health insurers have been going deal crazy recently, possibly as a result of Obamacare.

A couple of major deals this year have included Anthem takeover of Cigna for $54.2 billion and Aetna's takeover of Humana for $37 billion. Those two deals alone could pay out up to $345 million in fees to Wall Street.

?And then of course there's the Wall Street money tree Allergan.

It recently made a deal to be bought by Israeli pharmaceutical Teva for about $40.5 billion. That was the latest in a series of deals involving Allergan, including when Actavis bought the company and kept the name.

Those two firms had generated some $780 million in fees for Wall Street between 2012 and the July deal with Teva.

Now the total should be somewhere closer to $820 million. JPMorgan is expected to receive between $35 million and $45 million in fees from Allergan for that deal.

JPMorgan tops the league tables in healthcare banking, according to Dealogic, with an 11.6% share of fees. Goldman Sachs follows with 10.5%, while Morgan Stanley has 7.3% of fees.