Since unknown deaths are unknown, it is obvious that nobody knows how many there are.
Tornadoes caused 44 deaths in the U.S. in 2010 and an unknown number worldwide.
There were an unknown amount of injuries but there were 446,500 deaths during WWII.
Drinking alcohol in moderation does not cause any deaths. However, abusing alcohol results in an unknown number of injuries and deaths.
It is unknown how many people have died while using an electric skateboard. One of the most notable deaths involving an electric skateboard was the death of George Schnakenberg III. He was the founder of an alternative energy design firm.
According to the Centers for Disease Control and Prevention (CDC), there were 44 reported deaths in 2009 in the United States directly related to bullying.
I don't think any record keeping is kept of deaths of Jehovah's Witnesses so I would say unknown.
It is unknown how many people have died total in Australia. Seven deaths for every 1000 people per year is their average.
People rarely die during Qudditch and any deaths were unknown.
On average, there are around 200-300 cases of deaths from unknown causes recorded in the U.S. each day. Autopsies and further investigations are usually required to determine the specific cause of death in such cases.
4762 deaths
how many deaths in kamchatka's earthquake in 1923
110