Languages of Luxembourg: Official, Administrative & Spoken

The question asks about "literacy" but lists languages. Here's the linguistic landscape of Luxembourg:

Official Languages (Constitutional)

• Luxembourgish (Lëtzebuergesch) – National language (since 1984); spoken by ~90% of residents.
• French – Language of legislation, courts, administration, government.
• German – Language of print media, church, some education; co-official.

Widely Spoken Non-Official Languages

• English – Business, finance, EU institutions, tourism, education (widely fluent).
• Portuguese – Largest immigrant community (~15% of population); community media, commerce.
• Italian – Historical immigrant community; cultural presence.

Literacy

Adult literacy rate: ~99–100% (near-universal). Education is compulsory to age 16; trilingual school system (Luxembourgish → German → French) produces high multilingual literacy.

Language Law (1984)

Established Luxembourgish as national language; French as legislative language; German and French as administrative/judicial languages. Citizens may address administration in any of the three; reply in the same language.