Demographics for offenders aren't forthcoming. A brief search yielded:

https://nltimes.nl/2025/06/05/sexual-violence-reports-netherlands-surge-54

Embedded link article:

https://nltimes.nl/2024/07/01/tougher-laws-sex-crimes-harassment-abuse-take-effect-netherlands-today

https://eige.europa.eu/gender-based-violence/countries/netherlands?language_content_entity=en

https://www.cbs.nl/en-gb/news/2024/48/over-1-7-million-victims-of-sexually-transgressive-behaviour

Being a pharmaceutical researcher, Wesker likely could have done this with more access to paywalled studies.