0120-6346 0120-6346 S0120-63462020000100225 10.22395/seec.v23n54a11 Poland 00 06 2020 00 06 2020 23 54 225 237

2015 202 CBS -Central Statistics Bureau 2020 CN -Cabinet of the Netherlands 2019 237 Compass Education 2017 13 Deltawerken Online 2004 EP -European Parliament 2018 Eurostat 2020 MR -Municipality of Rotterdam 2013 137 MR -Municipality of Rotterdam 2018 a 21 MR -Municipality of Rotterdam 2018 b 11 MR -Municipality of Rotterdam 2019 a 9 MR -Municipality of Rotterdam 2019 b 24 MR -Municipality of Rotterdam 2019 c 43 MR -Municipality of Rotterdam 2019 d 24 MR -Municipality of Rotterdam 2019 e 46 MR -Municipality of Rotterdam 2019 f 32 MR -Municipality of Rotterdam 2020 4 2017 140 140 369-80 OECD -Organization for Economic Co-operation and Development 2020 PR -Port of Rotterdam 2019 4 2019 2942 2942 1-330 UN -United Nations 2015 25 2019 16