This was the fourth consecutive year that emigration to Switzerland has declined significantly after having reached its peak in this century in 2013. For 15 years that the number of Portuguese who entered Switzerland was not so low. The recessive trend reflected a relative loss of importance of Portuguese immigration: if in 2013 the Portuguese accounted for 12% of migrants' arrivals into Switzerland, in 2017 they accounted for only 6.3%.
Link https://www.bfs.admin.ch/bfs/fr/home.html
Cite as Vidigal, Inês (2018), “Fewer Portuguese entries in Switzerland for the fourth consecutive year”, Observatório da Emigração. http://observatorioemigracao.pt/np4EN/6273.html