international labels. Few of the major international schools are the Tirana International School, Albanian International School, British School, Montessori School, Memorial Schooland and World Academy. Also of noteworthy mention is the public primary and secondary Servete Maçi School, which received international recognition as it won an award at the 2020 International Architecture Awards. Health There are numerous public and private hospitals as well as smaller public and private health care facilities in the territory of Tirana. The Mother Teresa University Hospital is one of the largest medical tertiary institutions of the country. Other medical institutions include the Shefqet Ndroqi University Hospital, Koço Gliozheni Hospital, Mbretëresha Gjeraldinë Hospital and the Military Hospital. Demography The Institute of Statistics (INSTAT) estimated the population of the municipality of Tirana at 418,495 in 2011. With a population density of 502 people per square kilometre, Tirana is the most densely populated municipality in the country. The encompassing metropolitan area, consisting of the regions of Durrës and Tirana, has a combined population of approximately 1 million amounting to nearly one third of the country's total population. Historically, Tirana has experienced a steady population increase in the past years, especially after the fall of communism in the late twentieth century as well as the beginnings of the twenty-first century. The remarkable growth was, and still is, largely fueled by migrants from all over the country often in search of employment and improved living conditions. Between 1820 and 1955, the population of Tirana tenfolded while during the period from 1989 to 2011, the city's population grew annually by approximately 2.7%. In the 19th and 20th centuries, the city had a rate of growth less than 1% annually until the 1970s, then down to less than 8% per year until the middle 20th century figures. Tirana's population is composed by a mixture of different cultural and ethnic groups from Southern Europe. The most represented ethnicities are Albanians (84.10%), Greeks (0.35%), Aromanians (0.11%), Macedonians (0.07%) and Italians (0.03%). In Albania, a secular state with no state religion, the freedom of belief, conscience and religion is explicitly guaranteed in the constitution of Albania. Tirana is religiously diverse and has many places of worship catering to its religious population whom are adherents of Islam, Christianity and Judaism but also of Atheism and Agnosticism. They all maintain their Albanian headquarters spread across the territory of Tirana. Nevertheless, the Bektashi Order leadership established their world