More than 10 million
3 million by Jan 2010
No
3 million as of January 26, 2010 according to the Wikipedia. see related link
many are sold
4.7million
It is difficult to answer how many hats are sold in the US or UK or in the world.
172,907 new cars were sold in July, 2014. The automotive industry in the UK estimates 2.45 million cars will be sold in 2014.
12.5
4500
no
On average, around 100 million tea bags are sold in the UK every day.
165,000