Table 2. Stateless/unknown nationality – sex Males Females 50,194 (59%) 34,875 (41%) Source: CBS, situation 01 January 2010 46. As table 1 shows, the Central Bureau for Statistics, in its “Statline” database, reported that on 1 January 2010 there were 85,069 persons living in the Netherlands without a nationality or with an unknown nationality. This category is defined by the CBS as “persons who are not considered as a national by any State or whose nationality cannot be established”.61 A little more than 85 per cent are younger than 45 years (table 1) and almost 60 per cent are male (table 2).62 These 85,069 persons constituted 11.5 per cent of the total number of registered aliens in the Netherlands (735,197). This large category can be broken down into those registered as stateless persons and as persons of unknown nationality. The former group (stateless) is markedly smaller, consisting of 2,062 persons on 1 January 2010, whereas the latter group (“nationality unknown”) comprises 83,007 individuals.63 To the extent that individuals from these two categories migrated to the Netherlands, it is useful to inquire into the size of these migration flows (table 3). Table 3. Migration flows in the Netherlands, 2008 Total Stateless Unknown Nationality Emigration 90,067 43 374 Immigration 143,516 207 9,021 Source: Eurostat, 2008 47. Clearly, in 2008, the most recent year for which data was available, immigration to the Netherlands outpaced emigration and this pattern extended to the flow of stateless persons and persons of unknown nationality as well. 48. It is possible for both stateless persons and persons of unknown nationality to acquire Dutch citizenship. Table 4. Grounds on the basis of which Dutch nationality has been acquired by stateless persons and persons of unknown nationality, 2009 Ground for acquisition Nationality Unknown Stateless Emigration 10 5 Immigration 45 13 25 7 Judicial determination of paternity Right of option 127 42 Naturalization 4,634 45 64 Co-naturalization 2,188 46 Total 7,029 158 Source: CBS, 2009 61 CBS, available at http://tinyurl.com/3vr3urm [accessed 5 January 2011]. 62 CBS, available at http://tinyurl.com/3a7mnzc [accessed 5 January 2011]. 63 CBS, data not available on Statline but on file with UNHCR. 64 Refers to the possibility for applying for Dutch nationality under Article 6(1)b of the DNA. in the Netherlands 21