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That is a statistic that doesn't exist; you can only compile information for sightings that find their way into official records.
In other words, when a person anywhere in the world sees something flying that they can't identify, who are they going to report it to; call 911 or the military, the local airport, or the local news. Each of those people may choose a different option. Who they contact and what becomes of that report can't guarantee that it will find its way into an official record from which statistics can be compiled.
What else can I help you with?
How many tornadoes have hit Arizona since 2000?
Since 2000 there have been 53 tornadoes in Arizona.
How many year have iPod been around?
iPods have been around since the year 2000.
How many dolphins have died since year 2000?
according 2 a study by University of panalory an estimated 47,000
How many injuries are caused in war every year?
5 Million, that is the average rate every year since 2000
How many epl titles have Arsenal won since the year 2000?
2. In 2002 and 2004.
How many white sofas have been sold since 2000?
There is no accurate information available as to how many white sofas have been sold since the year 2000. Further specification may be required to answer this question correctly.
What day has it rained on every year since 2000?
It has rained on every day of every year since 2000 somewhere in the world. There is never a day when it does not rain anywhere.
How many days in each year since 1995?
1996, 2000, 2004, 2008 and 2012 each had 366 days. Every other year since 1995 (including 1995) had 365 days.
How many Tuesdays in the year 2000?
52 tuesdays were in the year 2000
How many tornadoes have been since the year of 2000?
worldwide data is not available. Since 2000 there have been 16,818 recorded tornadoes in the U.S. Note that the figure for tornadoes so far in 2013 is only a preliminary estimate.
Who has the most strikeouts since the year 2000?
Randy Johnson
What new diseases have emerged since the year 2000?
covid
