2002-22: 20th anniversary of euro banknotes and coins

On 1 January 2002, people in 12 EU countries began using euro banknotes and coins. Since then, many new members have joined the euro, which twenty years down the road is now used every day by over 340 million people in 19 EU Member States, becoming the world's second most important currency.

https://www.ecb.europa.eu/euro/20_years_of_euro/html/index.en.html