i came across a figure of the number of explosive decompressions but i can't find it now. it was something like 1 in 50,000 flight hours. what happens is this. there is an air bladder seal around the door and when you turn on the compressor the bladder inflates and seals the door. now, there are valves that regulate the cabin altitude, typically to hold the pressure in the cabin to 8,000 feet but you can adjust that. if your at altitude and the seal pops or a window breaks somehow then you have your explosive decompression. usually though you'll get a sticking or leaking valve that would be the cause and that would just cause discomfort and the pilot would execute a decent to below 12,000. ah,
HERE is the site i found earlier....