Motorsports Trends, which sports are hot and which ones are losing fans?

Ish and I were talking at lunch about motorsports because we are both driving in events this weekend.  He's drifting and I'm going to do some solo rallycross again.  We had this long discussion (for the most part we agreed which is rare) about which sports are growing and which ones are losing fans.  This was all just hot air and bench racing until I remembered that it's possible to use the Google trends analysis to gauge interest in certain search terms.  Now we can reveal which sports are as hot as "Miley Cyrus VMA Twerking" and which ones are dying the slow death of "Yolo Swagger". You'll need java enabled to see the charts embedded in this post