The change is driven by drugs-associated crime. This has increased a lot.
As a former Amsterdam resident, another thing that has increased a lot is drugs-tourism. It's a class of tourism no Amsterdammer is happy about (except the coffeeshopowners). The Amsterdam center is basically a no-go zone for many residents, it suffers from the usual European inner-city-tourism-blight, with a significant share of drunk and high tourists sprinkled on top. The city of Amsterdam already stopped their advertising campaign last year and wanted to improve the 'quality' of the tourists it is attracting: less poor backpacking weed-seekers, and more middle-class and rich-class art-seekers.
As a former Amsterdam resident, another thing that has increased a lot is drugs-tourism. It's a class of tourism no Amsterdammer is happy about (except the coffeeshopowners). The Amsterdam center is basically a no-go zone for many residents, it suffers from the usual European inner-city-tourism-blight, with a significant share of drunk and high tourists sprinkled on top. The city of Amsterdam already stopped their advertising campaign last year and wanted to improve the 'quality' of the tourists it is attracting: less poor backpacking weed-seekers, and more middle-class and rich-class art-seekers.