Answer
In the Netherlands, an annual [i] average of 24 young road users aged 12 to 17 are killed in traffic (see figure 1). It is unknown how many young road users get injured, because the numbers cannot be disaggregated for age in any reliable way.
Figure 1. Number of road deaths among young road users aged 12 to 17, between 2009 and 2018 [i]. Source: Statistics Netherlands (Road Death Statistics).
[i] This is the annual average of 2009-2018. In later years, the actual numbers were not disaggregated for this age group.