Overall the NHL attendance is relatively flat year over year with an increase from 17,233 last year through November games to 17,280 through this year.
On a team by team level, 4 teams saw an increase over 5% from last year while 3 teams saw declines of 5% or greater. Edmonton saw a large spike due to the new arena they are playing in this year while the Ottawa Senators saw the largest drop, down 13.3% through the November games.
You can drill into each teams performance to date using this interactive dashboard by selecting a team in the drop down in the upper right corner. (I apologize in advance. It is not mobile friendly.)