Registration Data for (Very) Long Letter Domains

We've done this for numerics, and thought it would be interesting to see how registration rates look for longer letter domains.  Like much longer letter domains.  Here are the number of registered letter domains according to dofo for all strings of letters, from 1 letter domains up to 30 letter domains.  Only .coms were looked at.

What is interesting is that the number of .com letter domains peaks at 11-length (9.6 million registered).  Then registration rates start to fall, but not by much. 

Number of Letters		Number Registered
1		26
2		676
3		17,576
4		456,976
5		3,257,718
6		5,690,913
7		6,233,995
8		7,648,600
9		8,582,454
10		9,423,782
11		9,649,620
12		9,461,404
13		8,969,298
14		8,282,875
15		7,329,996
16		6,376,458
17		5,492,672
18		4,549,593
19		3,698,050
20		3,020,999
21		2,389,850
22		1,880,458
23		1,469,796
24		1,118,642
25		838,496
26		630,085
27		460,372
28		334,697
29		245,998
30		177,835