BMW is not doing much well either. They reported a Nov 16 US sales drop of 18.2% YoY, to 26,000 units. Still, BMW sells in two months what Porsche sells in about a year:
BMW Group U.S. Reports November 2016 Sales - KSWO, Lawton, OK- Wichita Falls, TX: News, Weather, Sports. ABC, 24/7, Telemundo -
In 2013, the worldwide sales difference between BMW or Audi and Porsche was about 10:1. Here's the sales data for the first two for that year:
It appears Porsche is wining the SUV battle.