I agree! A simple spreadsheet would provide such information at a glance! Surely their system should be able to filter country, type of visa requested, number applied for and number granted! I will leave it to others to pick which visa you tackle first!
And they already release spreadsheets every quarter with immigration statistics on them - including total numbers of applications and rejections of visa types, total number of applications from each country:
https://www.gov.uk/government/collections/immigration-statistics-quarterly-releaseUnfortunately, they aren't quite as detailed as you would hope, and I'm not sure which category of visa a returning resident/adult dependant would be classed as.
The family visas are split into:
Partner
Partner (for immediate settlement)
Child
Child (for immediate settlement)
Other
Other (for immediate settlement)
For reference though, according to Table 3 (spreadsheet) the total number of each of the above issued in the US in the first 3 quarters of 2016 (up to September) was:
Partner: 1343
Partner (for immediate settlement): 5
Child: 1
Child (for immediate settlement): 13
Other: 6
Other (for immediate settlement): 0
Since there was such a backlog, I'm assuming there will have been more visas issued in the 4th quarter (not published yet) than in the 3rd.
and in 2015:
Partner: 2038
Partner (for immediate settlement): 8
Child: 0
Child (for immediate settlement): 23
Other: 11
Other (for immediate settlement): 8