The information about the position of the magnetic poles is only accurate for 2007. Try to find some more recent information more recent measurements. Also add some previous locations (but not more than 10). However previous locations should only show up on higher zoom levels, so you need to make the required code changes to adjust for a different popularity index. the previous positions should include the year in the label. In addition or as an alternative the movement of the magnetic poles could be displayed as a KML linestring (which only shows up at higher zoom levels while the current position of the magnetic pole is always visible).