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275 mm
5.5 million per year (as of 2010)
Platt National Park was renamed and re-designated into a more appropriate name, Chickasaw National Recreational Area, on 1976 March 17. Its annual number of visitors has been about 1.3 to 1.5 million for the last decade or so. The NPS has no online records indicating what percentage of these come from outside the U.S., but I would be surprised if there has been NO international visitors.
I think the Vikings were the first visitors.
The annual average number of airplanes in the air can vary greatly depending on the time of day, day of the week, and season. However, on average, there are estimated to be around 9,700 planes airborne at any given time globally.
Around 1.5 million annual visitors.
The mean change was -150.
According to official NPS stats, the annual number of visitors to Haleakala NP has been between one and two million since 1984. The average has been about 1.5 million, and in 2012 the number was 1.094 million visitors.
From 1983 onward, annual visitation to Glacier NP has been between 1.5 and 2 million. These number can vary by a factor of over 100 from month to month: as few as 5000 visitors in some Decembers, and over 673,000 in one July.
Alien numbers normally start with A#followed by an eight-digit numbers. You will have an alien number only if you filed certain immigration petitions such as I-485, EAD, etc. Visitors/tourists) aren't issued an alien number.
The US Department of Commerce holds data on the total number of overseas visitors to the US on a monthly and annual basis. This is perhaps a more accurate reflection of the number of vacations purchased. For 2012, 61,149,684 foreigners passed through Homeland Security. Assuming that a 'typical' family of three are on vacation, that equates to approximately 56,000 vacations to the United States purchased daily and rising!
Dogs protect us from and warn us about "visitors", geese make noises to warn us of "visitors", and the animal at zoos enlighten us as to the wonderful world we are surrounded by.