It works for democratic heads of state as well. (link)
Legend:
1940s
1950s
1960s
1971 - 1985
1985 - 1991
1991 - 2000
2000 - 2005
After 2005
A few are a bit off, but the general idea should be correct.
And the map isn't pointless. A head of state is not necessarily the political leader.
Off by a year as I based it on length in position (as of June 22, I believe),
over 60 years
50-60 years
40-50 years
30-40 years
20-30 years
10-20 years
5-10 years
0-5 years
There are a couple that are off that I know of. At least one switched categories between making the map and now.
I split up the bottom one to try and take a few out of that category.
And, yes it does mean nothing, but that doesn't matter.
I was hoping the different Commonwealth Realms territories may confuse people since they are based on independence, not the Queen's initial coronation.
contre or tailess go ahead you got the idea and specifics, respectively.