in the city. Data taken from mobile phone movements around the city suggest that the real population of Prague is closer to 1.9 or 2.0 million, with an additional 300,000 to 400,000 commuters coming to the city on weekdays for work, education, or commerce. About 14% of the city’s inhabitants were born outside the Czech Republic, the highest proportion in the country. However, 64.8% of the city's population self-identified as ethnically Czech, which is slightly higher than the national average of 63.7%. Almost 29% of respondents declined to answer the question on ethnicity at all, so it may be assumed that the real percentage of ethnic Czechs in Prague is considerably higher. The largest ethnic minority are Slovaks, followed by Ukrainians and Russians. Prague's population is the oldest and best-educated in the country. It has the lowest proportion of children. Only 10.8% of census respondents claimed adherence to a religion; the majority of these were Roman Catholics. Historical population Development of the Prague population since 1378: Culture The city is traditionally one of the cultural centres of Europe, hosting many cultural events. Some of the significant cultural institutions include the National Theatre (Národní Divadlo) and the Estates Theatre (Stavovské or Tylovo or Nosticovo divadlo), where the premières of Mozart's Don Giovanni and La clemenza di Tito were held. Other major cultural institutions are the Rudolfinum which is home to the Czech Philharmonic Orchestra and the Municipal House which is home to the Prague Symphony Orchestra. The Prague State Opera (Státní opera) performs at the Smetana Theatre. The city has many world-class museums, including the National Museum (Národní muzeum), the Museum of the Capital City of Prague, the Jewish Museum in Prague, the Alfons Mucha Museum, the African-Prague Museum, the Museum of Decorative Arts in Prague, the Náprstek Museum (Náprstkovo Muzeum), the Josef Sudek Gallery and The Josef Sudek Studio, the National Library, the National Gallery, which manages the largest collection of art in the Czech Republic and the Kunsthalle Praha, the newest museum in the city. There are hundreds of concert halls, galleries, cinemas and music clubs in the city. It hosts music festivals including the Prague Spring International Music Festival, the Prague Autumn International Music Festival, the Prague International Organ Festival, the Dvořák Prague International Music Festival, and the Prague International Jazz Festival. Film festivals include the Febiofest, the One World Film Festival and Echoes of the Karlovy Vary