Grub- Your reply is spot on. It's a huge factor.
HH- I assume that somewhere between 300 mill and 65 mill is what is typical in a given year.
I'm not saying farmers didn't have a part in it last year, but it was mainly due to an unusually large crop as stated before. Farmers have been drying corn as long as I can remember. Here are some interesting facts...
"The U.S. is producing more propane than it did five years ago, but it’s exporting much more, too.
Domestic propane production increased 27 percent over the past five years to 1.4 million barrels per day, Reuters reports. Meanwhile, exports more than tripled in that time, from under 85,000 bpd in 2009 to a pace of 280,000 bpd in 2013 through October, the most recent month EIA statistics are available."
After last year's debacle, the government wants to regulate the propane industry now. Who wants that?