Depends how you look at the data.
I split the years so I could put in trend lines per year. As you can see the first two years are almost the same, and all three years trend upwards as the season progresses. I attribute this in large part to the fact that our first four matches are in freezing weather. Can't prove that that's the cause but that's what it feels like to me. We'll have to see how the rest of this year goes of course but in warmer weather and with a good stretch run to the playoffs we could get attendance back up. Hopefully that's how it'll play out as that will cancel out the initial overall downwards trend.
A couple of notes though. 2015's trend would be more like the others if you discounted the initial burst of newness, which would also flatten out the full-span trend a good bit. And this year's trend while not suspect does need a bit of a grain of salt as it's not a full year of course. Looks good though, especially if we can go anywhere in the playoffs.
Lastly, anyone have any charting apps that A) can do things like separate trendlines on selected data rather than forcing me to copy and paste data all over the place into separate spreadsheets and B) not cost an arm and a leg? It'd be great to have a line for all three years together on top of what I have above but there's no way to do that without making layers in a graphics program and that's a large hassle to make sure everything lines up.