If you mean question-submitters, the answer is about 140,000. If you include answer-submitters, the figure goes up.
Lots of people.
aprox. 80- 90 billion
44 million every month
nameberry.com has over 750,000 unique visitors per month.
The park receives about 4 million visitors a year, which works out to an average of 333,000 per month. However, more visitors come in the summer than in the winter.
They attract around 1500 visitors each month. More information on this topic is located on various online information websites such as Wikipedia and EHow.
More than 800,000 visitors a year
The Sphinx in Egypt receives an average of around 14,000 visitors per month. It is one of the most popular tourist attractions in Egypt and sees a steady flow of visitors throughout the year.
over 7 million.
Biscayne Bay National Park typically receives around half a million visitors annually.
4 or 5
The simple subject is "visitors". "Many" is an adjective modifying "visitors"