"Despite mounting awareness campaigns, grain bin accidents continue, with 2010 ranking as the most hazardous year on record, according to Purdue University: 59 entrapments and 26 deaths. There were 33 entrapments and 13 deaths in 2013, and 38 entrapments and 17 deaths in 2014."
This is from AG-Web in a 2016 article. The article states that the threat is growing, but it's hardly a daily occurrence.