About 60 million, with an interesting geographical distribution. Here are data from the 2002 agricultural census:
http://www.nass.usda.gov/research/2002mapgallery/livestock/hogsandpigs.html
how many litters per year does a potbelly pig have
millions
A billion!
Avg. piglets per litter is 9.5
According to the Shark Foundation, approximately 40 people per year are killed by pigs in the USA and Canada, but that includes fatal car crashes into pigs (which can weigh over 1000 pounds), not just people directly mauled by swine. The "National Bureau of Swine Violence" and its 20000+ statistic are fake, fake, fake.
how many people get bronchitis per year
about 5 per year
It is impossible to tell because average consumption is based on the amount of meat or beef consumed per day (or year), not "how many cows [that] are eaten...[per] day." Thus the question has no merit no matter how you try to look at it.
Guinea Pigs don't reproduce per day.
how many people get mononucleosis per year and whats the normal age to get it?
1 per year
About 4 million per year