This is an English translation. The original Dutch article is authoritative.
Friday 15 February 2019, the THC report 2017-2018 was released.
The average THC content in the most popular Dutch cannabis sold in coffeeshops (16.8%) remains unchanged compared to last year. Looking back slightly further, a minor increase is visible over the past 5 years. For imported hashish, the average content has never been so high (23.5%); this level is much higher than five years ago (the average in 2014 was 14.9%). This is likely due to the increased use of plants of Dutch origin in Morocco.
You can download the report at https://www.trimbos.nl/kennis/feiten-cijfers-drugs-alcohol-roken/thc-monitor/ .
Should you have any questions, you can contact;
Sander Rigter, srigter@trimbos.nl .
Additionally, the 2018 Annual Report of the Nationale Drug Monitor was published last week, featuring a chapter dedicated to cannabis https://www.trimbos.nl/actueel/nieuws/bericht/highlights-nationale-drug-monitor-2018