Nine billion. That's how many burgers were served by American restaurants in 2014, which is slightly more than one burger for every single person currently on Earth (you only had one burger... right?). The beefy sandwich had a remarkable year -- up 3%, or 30 million, from 2013 -- probably because it was also the year a bunch of absolutely insane ones were made.
At foodservice counters and restaurants all across the country, people eschewed grilled chicken sandwiches (sales of which were down 9% from 2013, and which are apparently "even more ubiquitous" on menus than burgers) for burgers, according to market research firm NPD Group. Sandwiches had a 2% decline in order frequency, but maybe that's because the restaurant people just started calling all their sandwiches "burgers?"