Just while I'm explaining google trends to people, this is an important graph to see:
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Now just to explain, I use worldwide for this because if I only use Australia it cuts off the NRL support for the Warriors in NZ. Basically NZ, NSW & QLD are for the NRL what VIC, WA & SA are for AFL. That said the trend line for growth is roughly the same for the NRL if you only look at Australia (actually it results in an either bigger growth rate for the NRL but I still think it's important to include NZ).
So look at 2004. The NRL average was 25 to AFL's 49. Basically, people searched for AFL twice as much as NRL. Not surprising to be honest. NRL was only a couple of years out from Super League and it was on a low ebb.
In these 20 years search interest for the AFL has gone from an average of 49 to 80 -- a 63% increase. Population growth was about 35% in that time. So that's an organic increase for the AFL.
However, the NRL has gone from a 25 average in 2004 (it wasn't much higher in 2005 either) to a 76 average in 2003 - so it has TRIPLED the volume of searches for NRL in that time - remember population growth was only 35%. 304% vs 35%.
Now it's not because NRL fans are better at using google than AFL fans (NRL fans are smarter though because they don't watch stringbeans in tank tops fumble and molest each other) or do it more often on an individual basis. It's organic GROWING interest in NRL, particularly growing since 2017, even despite the covid blip which you can also see.
I'd also argue that the peaks in 2023 for AFL weren't far off where they were in 2007 and 2011 for AFL. So basically, the peak interest for AFL today is roughly what it was 13-17 years ago. Their average in 2023 was similar to what it was 2007, 2017 and 2019 too. Make of that what you will.
You can also see the gap between the NRL and AFL has closed to the point where the week by week graph for 2024 looks like this:
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Now I may be just a backwater country media statistician and analyst, but that to me looks like two waves lines pretty much in synchronization. Essentially, the interest in AFL and NRL are now the same. If you include the boost from origin and internationals, I'd say overall in Australia and New Zealand, more people are searching for rugby league than AFL.
Now prediction time. If both trend lines continue, the NRL will start to pull away from the AFL and the gap will increase.