Also Bath first game was against Newcastle last year at home.....this year Saracens
On comparison of corresponding fixture's it was about 27 people on both Bath V Saracens games
This weekend is against Newcastle and you'll probably see a drop off to similar levels as before.
You need to compare corresponding fixtures from last year as who they playing probably matters way more than when.
Wasps V Sale: Last Year 12,329, This Year 12,018
Leicester V Bath: Last Year: Last Year 20,134, This year 22,582
So even by that evidence your up not down.