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I’m not totally clear on who, if anyone, to count during the Derg, so for now I’m going solely by the List of heads of government of Ethiopia page.

• Date of joining: 1945-11-13
• Expected count from Wikipedia (Makonnen Endelkachew onwards): 13
• Number in Wikidata: 8
• PositionHolderHistory warnings: 9
• Score: 62/130 = 48%

• Date of joining: 1945-10-25
• Expected count from Wikipedia (Petros Voulgaris onwards): 57
• Number in Wikidata: 53
• PositionHolderHistory warnings: 14
• Score: 502/570 = 88%

• Date of joining: 1961-10-13
• Expected count from Wikipedia (Maamun al-Kuzbari onwards): 29
• Number in Wikidata: 5
• PositionHolderHistory warnings: 9
• Score: 32/290 = 11%

I’m not clear enough on whether the Polish People’s Republic should be listed in Wikidata as the UN Member State pre-1989, but I think it makes sense within the scope of this project to only look at the Prime Ministers from 1989 onwards (especially given the government-in-exile issues):

• Relevant date: 1989-08-24
• Expected count from Wikipedia (Tadeusz Mazowiecki onwards): 17
• Number in Wikidata: 16
• PositionHolderHistory warnings: 4
• Score: 152/170 = 89%

We’re only considering the period since Russia succeeded the Soviet Union as a UN Member.

• Date of joining: 1991-12-24
• Expected count from Wikipedia (Boris Yeltsin onwards): 17
• Number in Wikidata: 15
• PositionHolderHistory warnings: 1
• Score: 148/170 = 78%

My confidence in how many we should expect is lower than usual due to the changes of role in the early 1990s, and the significant number of periods with an acting Prime Minister. I’ve gone with the count from Russian Wikipedia, though I’m not sure it fully represents all the changes that happened.

(Another slight tweak to the UN membership date was required first)

• Date of joining: 1946-07-04
• Expected count from Wikipedia (Manuel Roxas onwards): 12
• Number in Wikidata: 12
• PositionHolderHistory warnings: 4
• Score: 112/120 = 93%

This is another case where Wikidata has insufficient information on the “Office Held by Head of Government”, knowing only of the Prime Minister, even though this should also include the President of the Council of Ministers between 1976 and 2019. This means we actually have three sets to tally: 1945–1967 (Prime Minister), 1976–2019 (President of the Council), and 2019– (Prime Minister, again). However, as Wikidata doesn’t know this yet, we can currently only score the Prime Ministers:

• Date of joining: 1945-10-24
• Expected count from Wikipedia (Carlos Prío Socarrás onwards): 17
• Number in Wikidata: 5
• PositionHolderHistory warnings: 5
• Score: 40/170 = 24%

This is another case where Wikidata doesn’t yet know that the Prime Minister was the Head of Government prior to 1980, so we can only score the Presidents since then.

• Date of joining: 1945-10-24
• Expected count from Wikipedia (all): 7 + 26 Prime Ministers (Mohsen Sadr to Shapour Bakhtiar)
• Number in Wikidata: 8
• PositionHolderHistory warnings: 9
• Score: 62/330 = 19%

(After updating its UN Membership information)

• Date of joining: 1971-09-02
• Expected count from Wikipedia (Mahmoud Fawzi onwards): 23
• Number in Wikidata: 12
• PositionHolderHistory warnings: 7
• Score: 106/230 = 46%

(After tidying up the UN membership date)

• Date of joining: 1991-08-25
• Expected count from Wikipedia (Vyachaslaw Kebich onwards): 9
• Number in Wikidata: 9
• PositionHolderHistory warnings: 0
• Score: 90/90 = 100%