Researchers at the University of Valencia and Polytechnic University of Valencia in Spain invented the Happiness Index named HAIN in a study using official data from sources such as the UN, World Data Bank and Eurostat. They tested the index on 13 European countries for which all the data they wanted was available: Austria, Croatia, Cyprus, Czech Republic, France, Iceland, Latvia, Lithuania, Portugal, Slovenia, Spain, Sweden and the UK, according to dailymail.co.uk.

Professor Joan Micó, who was involved in creating the index, said: 'At the moment, happiness indexes are based on questionnaires that a certain sample of the population answer.

'They are therefore very subjective values. Unlike these, our index is created based on objective data, official statistics that represent a country's entire population,' the daily informs.

The Czech Republic ranks 7th within the sample of 13 European countries:

Source: dailymail.co.uk