You have to go back to the mid 1960's to find a time that VW had over 30% market share in Germany. It was eventually during the 1990's when the figure started dipping under 20%. There was an upturn a few years back when 21.8% was achieved - the best since 1989 - but things are on a down again. Of course, these things can be cyclical.
Another thing that intrigues me is the absence of many SUV vehicles. Other car makers have flocked there but VW has been tardy in that area. Also over the decade so far, there hasn't been new models tackling new segments. Still, VW has held its share remarkably well considering those factors.
Now looking at the share of leading models have of total VW sales, comparing 2010 to 2016. The Golf/Jetta 40.9 to 36.1%; Passat 10.8 to 12.3%; Polo 15.8 to 11.0%; Tiguan 6.3% to 9.8%; Touran 7.4 to 8.0%.
Of course, model cycles could affect these figures. However, it is impossible for the Golf to maintain that high figure and it is slowly going down. The Polo has done much worse and that is quite a drop in its share. Does it surprise that the Tiguan is on the rise?
Summary: VW can expect to lose more share yet but not that much as the local buyer in Germany is very supportive of the car industry, despite some fall out from the cheating it got itself into.
Data source: KBA.