<image>According to the "Road Traffic Safety Law of the People's Republic of China": If the blood alcohol concentration of a vehicle driver is between 20-80mg/100ml (excluding 80), it is considered driving after drinking; if the blood alcohol concentration is 80mg/100ml (including 80) or more, it is considered drunk driving. According to a report by "Legal Evening News," from March 15 to March 28, 2010, a total of 28,800 people nationwide were investigated for driving after drinking and drunk driving. The following frequency distribution histogram shows the blood alcohol concentration of these 28,800 people. The number of people falling under drunk driving is approximately ______.