What it does show, to me, is which forests are now used, and maybe which are underused nowadays. I haven't been to Tywi since the 2004 Mutiny/Severn Valley stages; I'm not even sure its still available.
Around 2000 onwards, I'd attend between 25-30 events a year - and quite often you'd visit the same area/forest for many different events throughout the year. The number of events which have gone is quite sad, but almost inevitable.

I may do a list when I get time, in regards to the events and forests used; for example, the Clocaenog/Alwen/Brenig area would host; RAC (WRC), Cambrian (BTRDA), Vauxhall Rally of Wales(BRC) and the Astra Stages (ANCRO). The latter two events no longer exist.