Primarily this is because of the introduction of the Bologna process: now more Dutch students are completing BSc and BA degres and now taking English-language MSc degrees which require the GMAT.

Thanks!
But 100% increase in 1 year with the stable results for the last five ones. It's pretty suspicious!) There must be some other reasons...

The Bologna process essentially ended in 2010. The first students in the Netherlands to go through the BA and BSc system are appearing. Almost all of them will do MSc degrees. You don't think that 1000 will want to do an MSc in English, perhaps in a university abroad?

If you can think of a better reason, let me know.

You mean the implementation of Bologna process have finished in 2010?

No, it's a very reasonable explanation, indeed. But Wikipedia says it started in 2002 - http://en.wikipedia.org/wiki/Education_in_the_Netherlands#Higher_Education
It's very intriguing and all my googling didn't help much.

Oh, I meant that the Bologna process *ended* in 2010. The Bologna Process was a decade-long project to create a European Higher Education Area. The EHEA was launched in 2010. The Netherlands had tested the shift from the Doctorandus degree to the BA/BSc in the period up to 2008, butt the rest of the system was not Bologna-compliant by then, especially in the uneven transition into doctoral studies (doctoral research was not a compulsory part of the evaluation of universities). Indeed, even now a few universities still have a two-year doctorate. So, it's really only in the period since then that Dutch students have enrolled in English-language BBA programmes, and thus been taking the GMAT.