Where is the licensing burden heaviest?

Adam Ozimek reports:

…consider the Institute for Justice’s excellent report on occupational licensing. The top 10 worst ranked jobs in terms of average licensing burden are as follows:

1. Preschool teacher

2. Athletic trainer

3. Earth driller

4. Cosmetologist

5. Barber

6. School bus driver

7. HVAC Contractor

8. Skin Care Specialist

9. Pest Control Applicator

10. Bus Driver

And from Virginia Postrel on Twitter:

Sting catches Charleston rickshaw driver giving illegal tour, $1,092 fine for talking history w/o a license http://buff.ly/1cTeo02  @ij

Here are previous MR posts on occupational licensing.