The guide who took us there told me there were 50 people dying every year. But I couldn't find any resources online to back it up. I'd trust him though as I've done it (it was my first time biking downhill for more than an hour).
I can tell that it was an amazing but scary experience. The adrenaline running in your veins will help you not to think about it. Make sure you pay attention to the road, not the landscape and you will be OK.
One of the gals in my group of 10 bikers fell twice during the way down. She was perfectly fine - only a few bruises here and there but nothing serious -, because she paid attention to the road. The mistakes he made coast him only a few bruises because they were related to the rocks or making turns too fast. Long story short: it's dangerous but if you focus, you'll have a blast.
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