Question: How many of Ernest Boiceau's countrymen spoke the same language as him in 2015?

Context paragraphs:
Swiss French: Swiss French (French: "français de Suisse" ) is the variety of French spoken in the French-speaking area of Switzerland known as Romandy.  French is one of the four official languages of Switzerland, the others being German, Italian, and Romansch.  As of 2015, around 2 million people in the country (24.4% of the population) spoke French as their primary language and around 29.1% of the population has working knowledge of French.

Transitional bilingualism: Transitional bilingualism is the shift from being bilingual, knowing two different languages, to only speaking one leading language.  This usually happens over a period of time and can be seen within a few generations.  There are families with immigrant grandparents who speak primarily their native language and some of the new country's language.  Their children then speak both languages, but the grandchildren only speak the dominant or preferred language of the new location.  The United States provides many examples of this phenomenon.  For example, a woman born and raised in Mexico moved to the United States and learned a bit of English and spoke a great deal of Spanish as well.  Her daughter, born and reared in the U.S. was equally fluent in both Spanish and English (bilingual).  The grandchild of the Mexican immigrant, who was born and has been reared in the U.S., speaks only English.

Ch’orti’ language: The Ch'orti' language (sometimes also "Chorti") is a Mayan language, spoken by the indigenous Maya people who are also known as the Ch'orti' or Ch'orti' Maya.  Ch'orti' is a direct descendant of the Classic Maya language in which many of the pre-Columbian inscriptions using the Maya script were written.  This Classic Maya language is also attested in a number of inscriptions made in regions whose inhabitants most likely spoke a different Mayan language variant, including the ancestor of Yukatek Maya.  Ch'orti' is the modern version of the ancient Mayan language Ch'olan (which was actively used and most popular between the years of A.D 250 and 850).

Språkåret 2013: Språkåret (The Language Year) in Norway was arranged with government support in 2013.  That year was 200 years after Ivar Aasen was born.  It was 100 years after Det Norske Teatret (The Norwegian Theatre) opened.  Ivar Aasen's life work was the development of Nynorsk (New Norse), a language with grammar and vocabulary based upon the way ordinary Norwegians, primarily rural, spoke.  After a few hundred years under Danish rule, many in the cities as well as everyone educated in Denmark, spoke and wrote Danish and Danish was taught in schools.  Det Norske Teatret is a theatre in Oslo that primarily produces plays in Nynorsk.

Ernest Boiceau: Ernest Boiceau (November 30, 1881 - March 16, 1950), born in French speaking Lausanne was a Swiss designer and decorator of the interwar period.

Elsie Vaalbooi: Elsie Vaalbooi (born c. 1901, died 7 October 2002) of Rietfontein in the Northern Cape was a South African woman who was a member of the ǂKhomani (Nǁnǂe) San or Bushmen and one of the last speakers of the Nǁng language.  In the 1990s there was concern amongst the ǂKhomani leadership about loss of the Nǁng language: many of those of the community who could speak a KhoeSan language actually spoke Nama.  Linguist Anthony Traill interviewed Vaalbooi in 1997, when she was in her late nineties.  The South African San Institute became involved in the pursuit of information on the language and, with the help of Vaalbooi, they were able to trace a further ten people who could speak the language.

Welsh people: The Welsh (Welsh: "Cymry" ) are a nation and ethnic group native to, or otherwise associated with, Wales and the Welsh language.  The language, which falls within the Insular Celtic family, has historically been spoken throughout Wales, with its predecessor Common Brittonic once spoken throughout most of the island of Great Britain.  Prior to the 20th century, large numbers of Welsh people spoke only Welsh, with little or no fluent knowledge of English.  While Welsh remains the predominant language in some areas of Wales, particularly in the north and the west, English is now the predominant language in most parts of the country; however, many Welsh people, even in predominately English-speaking areas of Wales, are fluent or semi-fluent in Welsh or, to varying degrees, capable of speaking or understanding Welsh at limited or conversational proficiency levels.

Thracian language: The Thracian language ( ) was the Indo-European language spoken in ancient times in Southeast Europe by the Thracians, the northern neighbors of the Ancient Greeks.  The Thracian language exhibits satemization: it either belonged to the satem group of Indo-European languages or it was strongly influenced by satem languages.  The language was still in use at least until the sixth century AD.  In 570, Antoninus of Piacenza said that in the valleys of Mount Sinai there was a monastery in which the monks spoke Greek, Latin, Syriac, Egyptian and Bessian, the language of the Bessi, one of the most prominent Thracian tribes.  The origin of the monasteries is explained in a mediaeval hagiography written by Symeon the Metaphrast in "Vita Sancti Theodosii Coenobiarchae", in which he wrote that Saint Theodosius founded on the shore of the Dead Sea a monastery with four churches, in each being spoken a different language, among which Bessian was found.  The place where the monasteries were founded was called "Cutila", which may be a Thracian name.  The further fate of the Thracian language is a matter of dispute.  Some authors like Schramm derived the Albanians from the Christian Bessi, or Bessians, an early Thracian people who were pushed westwards into Albania, thus making Albanian language descendant from Thracian, however this is one of many theories with mainstream historians supporting the Illyrian theory.  Some authors like Harvey Mayer group Thracian and Dacian into a southern Baltic linguistic family.

Portuguese Burghers: The Portuguese Burghers are an ethnic group in Sri Lanka, of mixed Portuguese and Sri Lankan descent.  They are Roman Catholic and spoke the Sri Lanka Indo-Portuguese language, a creole based on Portuguese.  In modern times, English has become the common language while Sinhalese is taught in school as a second language.  A large number of Portuguese Burghers living on the east coast of Sri Lanka are of Portuguese descent; this is evident in the Sri Lanka-Indo Portuguese language, which has many affiliations to Sinhalese and Portuguese.  They are mixed with other Burgher people, including Dutch Burghers.  However, Portuguese Burghers are not Dutch Burghers.

Judeo-Berber language: Judeo-Berber (Berber: , Hebrew: ברברית יהודית‎ ‎ ) is any of several hybrid Berber varieties traditionally spoken as a second language in Jewish communities of central and southern Morocco, and perhaps earlier in Algeria.  Judeo-Berber is (or was) a contact language; the first language of speakers was Judeo-Arabic.  (There were also Jews who spoke Berber as their first language, but not a distinct Jewish variety.)  Speakers emigrated to Israel in the 1950s and 1960s.  While mutually comprehensible with the Tamazight spoken by most inhabitants of the area (Galand-Pernet et al. 1970:14), these varieties are distinguished by the use of Hebrew loanwords and the pronunciation of "š" as "s" (as in many Jewish Moroccan Arabic dialects).

Supporting paragraphs: Ernest Boiceau Swiss French
Answer: 2 million