It's about 0.0000000008 times the number of Chickens in the World.
In other words, 15 is 0.000000000790 times the count of Chickens in the World, and the count of Chickens in the World is 1,300,000,000 times that amount.(a.k.a. fowl) (Gallus gallus domesticus) (2011 figures) (average population)
It's about 0.00000000005 times the number of Emails Sent per Day.
In other words, 15 is 0.0000000000510 times the count of Emails Sent per Day, and the count of Emails Sent per Day is 19,600,000,000 times that amount.(2010 figures) (estimated averages)
Each day, human computer users and automated programs send about 294 billion emails. Of those, an estimated 214 billion emails are spam advertisements for pharmaceuticals or drugs.