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As of 2020, Malta was the country with the highest number of parliament members per 100,000 inhabitants. This Southern European country counted 14.3 members in the parliament. By contrast, the Spanish parliament had the lowest number of members in proportion to the population.

In September 2020, a constitutional referendum was held in Italy on the number of parliament members. The Italian Parliament consists of the Chamber of Deputies and Senate of the Republic. The data depicted in the chart show the number of deputies before the referendum, which amounted to 630 members. For every 100,000 individuals, Italy had one deputy, one of the lowest number in the European Union in proportion to country's population. After the referendum, Italy could have just 0.7 members in the Chamber of Deputies per 100,000 population, ranking last in the EU.