It kinda looks like this.
There were 4.7 million cars by the end of 2010.
There were one-million cars in 1997. (actually, kinda surprised there were so many in ’97.)
The second million was reached in 2003.
The third million was registered in 2007.
And the fourth million was reached in early 2010.
You do the math.
( No. 15, February 27, 2011)