Question: What is the percent relationship of Catalan to the most used language in Catalonia?

full_context: Document 1: Catalan language: According to the Statistical Institute of Catalonia in 2008 the Catalan language is the second most commonly used in Catalonia, after Spanish, as a native or self-defining language. The Generalitat of Catalunya spends part of its annual budget on the promotion of the use of Catalan in Catalonia and in other territories.
Document 2: Dialect: The Sardinian language is considered to be its own Romance language family, separate not only from standard Italian but also the wider Italo-Dalmatian family, and it includes the Campidanese Sardinian and Logudorese Sardinian variants. However, Gallurese, Sassarese, and Corsican are also spoken in Sardinia, and these languages are considered closely related or derived from the Italian Tuscan language and thus are Italo-Dalmatian languages. Furthermore, the Gallo-Romance language of Ligurian and the Catalan Algherese dialect are also spoken in Sardinia.
Document 3: Catalan language: The Germanic superstrate has had different outcomes in Spanish and Catalan. For example, Catalan fang "mud" and rostir "to roast", of Germanic origin, contrast with Spanish lodo and asar, of Latin origin; whereas Catalan filosa "spinning wheel" and pols "temple", of Latin origin, contrast with Spanish rueca and sien, of Germanic origin.
Document 4: Catalan language: According to Ethnologue, the lexical similarity between Catalan and other Romance languages is: 87% with Italian; 85% with Portuguese; 80% with Spanish; 76% with Ladin; 75% with Sardinian; and 73% with Romanian.
Document 5: Catalan language: On the other hand, there are several language shift processes currently taking place. In Northern Catalonia, Catalan has followed the same trend as the other minority languages of France, with most of its native speakers being 60 or older (as of 2004). Catalan is studied as a foreign language by 30% of the primary education students, and by 15% of the secondary. The cultural association La Bressola promotes a network of community-run schools engaged in Catalan language immersion programs.
Document 6: Southern Europe: The most widely spoken family of languages in southern Europe are the Romance languages, the heirs of Latin, which have spread from the Italian peninsula, and are emblematic of Southwestern Europe. (See the Latin Arch.) By far the most common romance languages in Southern Europe are: Italian, which is spoken by over 50 million people in Italy, San Marino, and the Vatican; and Spanish, which is spoken by over 40 million people in Spain and Gibraltar. Other common romance languages include: Romanian, which is spoken in Romania and Moldova; Portuguese, which is spoken in Portugal; Catalan, which is spoken in eastern Spain; and Galician, which is spoken in northwestern Spain.
Document 7: Catalan language: Catalan shares many traits with its neighboring Romance languages. However, despite being mostly situated in the Iberian Peninsula, Catalan differs more from Iberian Romance (such as Spanish and Portuguese) in terms of vocabulary, pronunciation, and grammar than from Gallo-Romance (Occitan, French, Gallo-Italic languages, etc.). These similarities are most notable with Occitan.
Document 8: Catalan language: Catalan dialects are relatively uniform, and are mutually intelligible. They are divided into two blocks, Eastern and Western, differing mostly in pronunciation. The terms "Catalan" and "Valencian" (respectively used in Catalonia and the Valencian Community) are two different varieties of the same language. There are two institutions regulating the two standard varieties, the Institute of Catalan Studies in Catalonia and the Valencian Academy of the Language in Valencia.
Document 9: Catalan language: Nowadays, France only recognizes French as an official language. Nevertheless, on 10 December 2007, the General Council of the Pyrénées-Orientales officially recognized Catalan as one of the languages of the department and seeks to further promote it in public life and education.
Document 10: Catalan language: In Andorra, Catalan has always been the sole official language. Since the promulgation of the 1993 constitution, several Andorranization policies have been enforced, like Catalan medium education.
Document 11: Catalan language: Catalan (/ˈkætəlæn/; autonym: català [kətəˈla] or [kataˈla]) is a Romance language named for its origins in Catalonia, in what is northeastern Spain and adjoining parts of France. It is the national and only official language of Andorra, and a co-official language of the Spanish autonomous communities of Catalonia, the Balearic Islands, and Valencia (where the language is known as Valencian, and there exist regional standards). It also has semi-official status in the city of Alghero on the Italian island of Sardinia. It is also spoken with no official recognition in parts of the Spanish autonomous communities of Aragon (La Franja) and Murcia (Carche), and in the historic French region of Roussillon/Northern Catalonia, roughly equivalent to the department of Pyrénées-Orientales.
Document 12: Catalan language: During much of its history, and especially during the Francoist dictatorship (1939–1975), the Catalan language has often been degraded as a mere dialect of Spanish. This view, based on political and ideological considerations, has no linguistic validity. Spanish and Catalan have important differences in their sound systems, lexicon, and grammatical features, placing the language in a number of respects closer to Occitan (and French).
Document 13: Catalan language: These territories are sometimes referred to as the Països Catalans (Catalan Countries), a denomination based on cultural affinity and common heritage, that has also had a subsequent political interpretation but no official status. Various interpretations of the term may include some or all of these regions.
Document 14: Catalan language: Standard Catalan, virtually accepted by all speakers, is mostly based on Eastern Catalan, which is the most widely used dialect. Nevertheless, the standards of Valencia and the Balearics admit alternative forms, mostly traditional ones, which are not current in eastern Catalonia.
Document 15: Dialect: In addition to having evolved, for the most part, separately from one another and with distinct individual histories, the Latin-based regional Romance languages of Italy are also better classified as separate languages rather than true "dialects" due to the often high degree in which they lack mutual intelligibility. Though mostly mutually unintelligible, the exact degree to which the regional Italian languages are mutual unintelligible varies, often correlating with geographical distance or geographical barriers between the languages, with some regional Italian languages that are closer in geographical proximity to each other or closer to each other on the dialect continuum being more or less mutually intelligible. For instance, a speaker of purely Eastern Lombard, a language in Northern Italy's Lombardy region that includes the Bergamasque dialect, would have severely limited mutual intelligibility with a purely standard Italian speaker and would be nearly completely unintelligible to a speaker of a pure Sicilian language variant. Due to Eastern Lombard's status as a Gallo-Italic language, an Eastern Lombard speaker may, in fact, have more mutual intelligibility with a Occitan, Catalan, or French speaker than a standard Italian or Sicilian language speaker. Meanwhile, a Sicilian language speaker would have an greater degree of mutual intelligibility with a speaker of the more closely related Neapolitan language, but far less mutual intelligibility with a person speaking Sicilian Gallo-Italic, a language that developed in isolated Lombard emigrant communities on the same island as the Sicilian language.
ground_truth: 80%
sub_queries: What is the most used language in Catalonia? Answer: Spanish
What is the percent relationship of Catalan to Spanish ? Answer: 80%