andyson thanks for the info'; I've no knowledge of this stuff, I just had a look at your graph.
It looks to me to show numbers down on last year but the numbers for the last month greatly exaggerate this. The difference in October is massive but looking at September there is little difference and in August the numbers are higher this year.
WGT will be hoping for a sharp rise in January as there has been in the last two years.
There may be reasons for some of the peaks and troughs connected to offers (free rentals etc), or something as simple as nine or ten weekend days in a particular month.
I'm not going to go through it in enough detail to give my uniformed opinion as to what's happening but as I indicated earlier, although it seems fair to compare the last completed month, I think the 36% drop this month is very misleading.