I thought that this might explain why some people say that data shows that earthquakes are increasing, while others say the data shows that they are not.

I made a graph of the number of significant earthquakes of magnitude 6.0 and greater using USGS data for 2002 to 20015. There was a steady increase; for example, there were about 45 in 2007, 55 in 2011, 70 in 2014. I couldn't find any explanation for this, but I wondered if this increasing trend correlates to increasing population density in earthquake zones.

I couldn't find a set of historical data for actual (significant and insignificant) over the same period of time.