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5/9 is a majority of conferences. I think OP made a fair assumption.

5/9 is also approximately half, and 5/10 is exactly half.

So, by definition, most of them? Seems like a trend.

Well, now, 5 of the last 10.

and more recently, 1 of the last 5.

Its currently 2018. Going back to 2009 = 9 years

Right, but 10 if you're inclusive.

sorry, i'm still not understanding how that works. from WWDC '09 to WWDC '18, inclusive of '09 and '18, is 9 events.

It's not.

1. 2009

2. 2010

3. 2011

4. 2012

5. 2013

6. 2014

7. 2015

8. 2016

9. 2017

10. 2018