The Bank for International Settlements published BIS Paper No 165 analysing how the US dollar’s share in the currency denomination of international debt securities has evolved, using a BIS-compiled security-level global database. The paper concludes there is no steady dollarisation or de-dollarisation trend; instead, the dollar’s share has moved in recurring “waves”, including three distinct waves since the 1960s. International debt securities outstanding rose from USD 2 billion in 1970 to USD 30 trillion by end-2024. Over 2000–24, the dollar’s share in outstanding stocks fell from about 60% in the early 2000s to about 43% in 2008, then recovered to about 60% by the latter half of the 2010s, leaving the 2024 share close to its level at the euro’s launch in 2000. The euro experienced a pre-global financial crisis “euro moment”, rising from 16% in 2000 to around 30% in 2008–09 before falling to around 22–23% in 2012–13 and stabilising, with the rise and subsequent slowdown in euro issuance largely driven by banks and non-bank financial institutions. The results are presented as robust to exchange-rate valuation effects, alternative sample definitions (including intra-euro area euro issuance and excluding own-currency issuance) and compositional shifts, and the paper also notes sticky country-level patterns such as emerging market issuers’ persistent preference for dollar issuance and a modest but rising renminbi share that by 2024 exceeded the Swiss franc’s and rivalled the Japanese yen’s.