sys_history_line - reporting on activity updates - eg. Field Changes, Email Sent etc

Running the latest version of ServiceNow (Utah I think) - when looking at an "incident" ticket, I can see a list of "Activities", eg:

• Field Changes
• Email Sent
• Additional Comments
• ...

Is there any way of me reporting against the table that holds that data?

ie. Reports - Create New -> Source Type: Table -> Table: (sys_history_line - is not appearing in the Table dropdown).

Has the name of this table changed in the most recent SNOW, or is the data held elsewhere?

Essentially, our tickets may have been assigned and re-assigned to a number of assignment groups, and I want to be able to report on how many times tickets have gone through specific assignment groups, not necessarily the one the ticket is currently assigned to, or closed by.

Any help would be really appreciated,

Thanks, Mark