The Promena movement demonstrated in Sofia in June 2003. A march has been held in the city every year since; by 2018 its organisers counted fifteen years and said the number of Bulgarians who had tried cannabis had grown from about 200,000 to more than a million.[1][2]
Listed for context. No score change is recorded for Bulgaria here.
References
Checked. The date and the event were compared with a source that was read.