Ireland went from being a poor, agrarian society to one with a high GDP per capita due to many global companies establishing headquarters there. It has experienced significant economic and technological growth, becoming known as the "Celtic Tiger." Unemployment has fallen to 6.4% and housing prices have yet to fully recover. Ireland has one of the highest human development and quality of life ratings. St. Patrick's Day is Ireland's largest national holiday celebrated worldwide with green attire and parades. Traditional festivals include May Day with flower decorating and Summer Day marking the summer solstice with bonfires.