Notes: Break in series in 1987 and 1997 for Sweden; in 1995 for Japan and Switzerland; in 1996 for Netherlands; in 1998 for Australia, Belgium, and Germany; in 1999 for United States; in 2000 for Canada and France; and in 2001 in the United Kingdom. Data were unavailable until 1990 for Germany. Previous year's data were used where one-year data were missing in 2005 for Australia; 2000 for United Kingdom; and 2017 for Belgium, France, Switzerland, and United Kingdom.