Why did the accident involvement of young (male) drivers drop with about 50%?

In the Netherlands, the absolute number of young drivers involved in serious accidents during the last ten years decreased considerably. Among young men, this number was reduced by almost 45% and among women the reduction was 36%. Moreover, this reduction was much larger than in any other age groups. A more detailed analysis of the data showed that the overall favourable safety trend in Holland in the last 12 years, can largely be attributed to the reductions in young driver accidents. The accident decline of the total group was 21,4%, of which 13% can be attributed to changes in the 8-24 year old age group