Today, Greeks are the majority ethnic group in the Hellenic Republic, where they constitute 93% of the country's population, and the Republic of Cyprus where they make up 78% of the island's population (excluding Turkish settlers in the occupied part of the country). Greek populations have not traditionally exhibited high rates of growth; nonetheless, the population of Greece has shown regular increase since the country's first census in 1828. A large percentage of the population growth since the state's foundation has resulted from annexation of new territories and the <answer>influx of 1.5 million Greek refugees after the 1923 population exchange between Greece and Turkey.</answer> About 80% of the population of Greece is urban, with 28% concentrated in the city of Athens
Where there any significances that contributed to the increase or decrease in population numbers ?
influx of 1.5 million Greek refugees after the 1923 population exchange between Greece and Turkey.