Here in the U.S. it was different. Reducing weight by using thinner high strength steel sheet allowed the car companies to meet reduced fuel requirements without sacrificing size, affordibility or safety. In the mid-90s, these consumers became increasingly focused on the safety of their cars. The regulations have not changed, nor have automotive safety standards. It is the consumer that is more aware.
Insurance companies do crash tests and publish the results.
Automakers needed ways to maintain or even improve the crashworthiness of their vehicles, while reducing overall curb weight and not sending sticker prices through the roof. Many critical components stamped with mild steel grades have been phased out and replaced with high strength steel materials. Since 1977, the average amount of high strength steel sheet per vehicle has jumped from 125 lbs. By comparison, aluminum's grand total started out at 90 lbs., and currently holds at roughly 236 lbs. The growth of aluminum is concentrated largely in engine blocks and cylinder heads that were at one time made of cast iron.