How many kangaroo crashes are there every year?

None.

Despite the fact that kangaroos are known to occasionally attack people, the only recorded fatality of a person by a kangaroo happened in 1936, in New South Wales. In this instance, a man was killed when he tried to rescue his dogs who were actually attacking the kangaroo.

Kangaroos jumping out in front of cars do contribute to car accidents. Meanwhile, both cyclists and motocyclists have been killed directly when they have hit these animals on the road, but this is uncommon, and no statistics are available.