There's quite a lot of information on fire deaths in the home in the LGA guidance to flats, written by Toddy.
There's such a wide spectrum of risk out there - the Scottish tenaments with not a fire door between them, the converted historic mansions, those converted to the 1936 PHA codes, many of which have rotten steel escapes from upper floor Windows, the purpose built flats compliant with CP3 in its various editions and finally those constructed to ADB / BS9991. Many of the modern buildings are timber framed and use modular construction.
That's before you throw in height and social demographics.
My prejudiced view is that due to the enforcement regimes in place, the golden years for good fire safety in flats were those constructed to CP3 / BS5588-1 in the 1950s to the 1980s and that standards have declined since the 1990s. But as for statistics you are right Jim, and the range is too diverse and number of deaths too small to draw any conclusions. And is always likely to be.