Notes: Canada and the Netherlands were excluded due to incomplete data. Data was not available for Australia before 2006, Switzerland before 2002, and Germany in 2002, resulting in breaks in lines. Data for the United Kingdom in 2020-2021 are estimates. There are breaks in series for Australia in 2012, France in 2003 and 2013, Germany in 2003, and Switzerland in 2009 and 2010. U.S. data through OECD was unavailable, so data from AHRQ HCUP was used instead.