Last

This

Year

Year

Base app to 1st add-on

12.3

12.1

1st add-on to 2nd add-on

10.5

10.2

1st add-on to 2nd add-on

 8.7

 8.9

1st add-on to 2nd add-on

 6.1

 6.7

1st add-on to 2nd add-on

 5.2

 6.5

Average Time Between Add-Ons

 8.6

 8.9