The Hollywood comedy is in decline. And there is a totally unfunny reason why.

Comedy Films as a Percentage of Total Releases, 2010-2014

(Source: Boxofficemojo.com, Nomura research) As the above chart from Nomura shows, the output of comedies as a proportion of total releases at the biggest Hollywood studios is in structural decline. Blame it on (or thank, if you prefer) the globalization of box office returns.

While fewer Americans are going to the movies, it is a totally different story in many other parts of the world, where cinema is booming. Non-U.S. moviegoers accounted for about 70% of global box office receipts last year (which hit $35.9 billion) compared to about 63% in 2007. Emerging economies are responsible for most of that growth, and there is plenty of room for more, because there are significantly fewer cinema screens per capita and lower ticket prices in these countries than in the U.S.

But the emerging world enthusiasm for Hollywood films does not extend to comedies, or at least not relative to its love of action movies and animated films. In China, for example, U.S. comedies account for only 10% of box office spending, compared to 25% in the U.S., Nomura says. By contrast, Hollywood action films are 44% of the box office in China (the latest Transformers release has broken just about every box office record in the country) as against 36% in the U.S.