So, there are a couple caveats to an answer to this: First, the Kosovo War of 1998-1999 falls outside the purview of this sub due to the 20-year rule. I can give some information on numbers but unfortunately, further discussion will have to wait until next year or be taken to one of the polisci subs.

Secondly, the numbers we have so far while sometimes rather certain are also still a work in progress. While certain minimum numbers have been established since the end of the war, independent research into, for example, the number of casualties in Croatia are reliant on numbers provided in 1995 by the Croatian government and work on independent verification or amending these numbers through a variety of NGOs in from of Documenta – Centar za suočavanje s prošlošću (Center for dealing with the past) has only begun in 2007 and is ten years later still an ongoing process.

Thirdly, there is always the problem with conflicts such as these to establish not just the status of casualties – with categories between military and civilian casualties blurred due to the nature of the conflict and things such as militias involved – but also the ethnicity. As you might be aware, the subject of ethnicity is a deeply politicized one in Yugoslavia and beyond. I have written about this before in this answer but drawing clear lines here is a rather difficult and politically charged undertaking and you as you can glean from my answer's information on Montenegro, the process of forming ethnic and group identity is still ongoing to this very day in some respects.

With that all said, here is the numbers we do have with a reasonable degree of certainty:

During the 10-day-war between Slovenia and Yugoslavia, the Slovenian government reports 18 dead and 182 injured, all of them Slovenian while the Yugoslav National Army estimates 44 dead and 146 injured, ethnicity in these cases unknown. The number of civilian casualties during this war is estimated at around 70 by the Slovenian government, with their ethnicity being unknown.

During the war with Croatia, according to information provided by the Croatian government in 1995, 12.131 Croats died during the war, 8.100 of whom were civilians, 33.043 Croats injured, and 2.251 Croats missing in action while 6.780 Serbs in Croatia were killed. The latter number about matches the information provided we have for the Republika Srpska Krajina with about 4,177 soldiers and 2,650 civilians killed or missing. An additional 1.200 Yugoslav National Army soldiers killed, ethnicity unknown but most likely Serb or Montenegrin. In addition about 220.000 Croats and 300.000 Serbs were displaced during the war.

During the Bosnian war, according to the research by the Research and Documentation Center in Sarajevo – and NGO partly funded by the Norwegian government and charged with gathering facts, documents, and data on genocide, war crimes, and human rights violations in Bosnia and Herzegovina, 101.040 people were killed from 1991 to 1996. 38.239 were civilians, 57.701 were soldiers, and 5100 were unknown both in terms of ethnicity as well as status. The list they researched is as follows:

• 31.107 Bosniak civilians and 30.906 Bosniak soldiers were killed with a total of 62.013 Bosniak casualties

• 4.178 Serb civilians and 20.775 Serb soldiers were killed with a total of 24.953 Serb casualties.

• 2.484 Croat civilians and 5.919 Croat soldiers were killed with a total of 8.403 casualties.

• 470 civilians of other ethnicity were killed as well as 101 soldiers of other ethnicity, making the total for other casualties 571 people.

• In case of 5100 casualties, both ethnicity as well as status are unknown.

I'm afraid though that including the information on who exactly is responsible for what (e.g. which number of Bosniaks was killed by Republika Srpska and which were killed by Serbian forces etc.) is research that is beyond me for the purpose of this answer as well as going into the difficulty of the Kosovo conlfict's casualties, which are even more based on estimate than the above numbers. Suffice to say that for some perspective, the number of Bosniaks killed during the siege of Sarajevo (14.000) is about the same number as the total of casualties of the Kosovo conflict and the total number of Bosniaks killed represents a loss of about 3% of the total number of all Bosniaks.

Sources:

• Marie–Janine Calic: "Ethnic Cleansing and War Crimes, 1991–1995". In Ingrao, Charles W.; Emmert, Thomas A. Confronting the Yugoslav Controversies: A Scholars' Initiative. 2012.

• Marko Attila Hoare: A History of Bosnia, 2007.

• Bosnian Book of the Dead – an evaluation report

• Misha Glenny: The fall of Yugoslavia: the third Balkan war.