Google Trends shows a peak in searches for "the trooper iron maiden" in August 2005, which correlates with the Ozzfest incident on August 20th. There's a small spike in the summer of 2006 (which could be due to the releases of AMOLAD and Guitar Hero II), then a slump throughout late 2006, possibly because they weren't playing it on the first leg of the AMOLAD tour?
A couple more spikes in 2008 - 2009 correlate with the Somewhere Back in Time tour/compilation album release, then another one in May 2010, though The Final Frontier was announced in early June. There's a bit of a drop off throughout late 2010 - early 2011, then another small spike in mid-2011 after it returned to the set of the Final Frontier Tour.
It's interesting that there's a slump throughout 2012 and early 2013, despite the Maiden England Tour having started. It picks up again when the tour resumes in the summer of 2013 and after the beer was launched, then interest starts to peter out. Something happened in October 2019 that caused a small spike, then Piece of Mind was shown in Stranger Things in July 2022, causing another spike.