You are right to ask, although the data on the website are mixed. From this report we have the following:
In the first six months of 2004 the number of emigrants that left the Netherlands amounted to 53 thousand, 6 thousand more than in the first six months of the previous year. More than half of these emigrants consist of people born abroad who leave the Netherlands after having lived here for a number of years. In the first six months of 2004 in particular the emigration of Turks rose substantially.
And yet Turkey ranks only 10th on the list of countries where Dutch expats live. Some of these destinations are countries (South Africa, Australia) where one might expect white Dutch to be going. From this report I found the following chart:
So it does seem that there has been an increase in returnees from Turkey at least; of Morocco, where many immigrant Dutch also come from, I can find nothing. It does seem though that older Dutch and Dutch interested in migration for economic reasons are leaving in larger numbers. That immigrants tend to have bigger families and that white Dutch are leaving Rotterdam, Amsterdam and the Hague will leave those cities with nonwhite majorities by 2030. On the one hand the number of native emigrants is small compared to just after the war, on the other it is occurring against the backdrop of a much more polyglot population, and so has a bigger effect on the ethnic balance.