This graph depicts the number of total naturalizations per year in Luxembourg from year 1994 until 2017 and the total of nationality acquisitions from year 2017 to 2021.
Notice the jump after year 2008 and 2017? Those years had significant changes to the rule, where it was considerably eased down.
Some of the main changes in 2008 were:
reduction of required residence limited to 7 years
reduction of required Luxembourgish language proficiency, to level B1 for oral comprehension, and A2 for oral expression
Luxembourg citizenship was passed to allow dual citizenship.
Some of the main changes in 2017:
required residence limited to 5 years
language test at the INL, the National Institute of Languages (no change in language level requirements)
compulsory attendance to "Vivre ensemble course" civic education course
Aggregated/macrolevel data:
Naturalizations in Luxembourg (1994-2021)
Population stock in Luxembourg by nationality (1875-2022)
Sex ratios in Luxembourg by nationality (1981-2011)
Most spoken languages by the foreign-born in Luxembourg (coming soon)
Native-immigrant employment, salaries and life satisfaction gaps in the EU and EFTA countries (coming soon)
Some harmonized individual level databases with instant access, where GDPR is not a thing:
LIS (Luxembourg Income Study). Contains 55 countries (available from1967-2020, depending on the country)
IPUMS (Integrated Public Use Microdata Series). Contains 106 countries (available from 1703-2015, depending on the country)
WVS (World Values Survey). Contains 62 countries (available from 1981-2022)
ISSP (International Social Survey Programme)
SILC (Survey on Income and Living Conditions). Direct access to the Italian series (1970-2022)
Some interesting sources of immigration policies databases
DEMIG (Determinants of International Migration) with migration policies for 50 countries, historical series
MIPEX (Migrant Integration Policy Index) contains specific immigrant integration, contemporary, policies index for 56 countries
KNOMAD (Global Knowledge Partnership on Migration and Development) includes current rights in different domains for refugees and economic migrants, all countries
IMPIC (Immigration Policies in Comparison) 35 (OECD) countries