Angola.....(1985)
Antigua.....(1903)
Argentina.....(1890)
Australia.....(1881)
Austria.....(1927)
Bahamas.....(1931)
Bangladesh.....(1970)
Barbados.....(1898)
Belgium.....(1889)
Belize.....(1915)
Bermuda.....(1896)
Bolivia.....(1920)
Botswana.....(1997)
Brazil.....(1922)
Bulgaria.....(2021)
Burkina Faso.....(2018)
Burundi.....(2007)
Cambodia......(2012)
Canada.....(1882)
Chile.....(1909)
China.....(1916)
Colombia.....(1985)
Congo, Republic of (Brazzaville).....(1937)
Congo, Democratic Republic of.....(1934)
Costa Rica.....(1907 and 1975)
Cuba.....(1918)
Czech Republic.....(1919 and 1990)
Denmark.....(1887)
Dominican Republic.....(1995)
Ecuador.....(1985)
El Salvador.....(1989)
Estonia.....(1927 and 1995)
Eswatini.....(1960)
Færoes, The.....(1924)
Fiji.....(1973)
Finland.....(1889)
France.....(1881)
French Guiana.....(1980)
Gabon.....(2018)
Georgia.....(1993)
Germany.....(1886)
Ghana.....(1922)
Greece.....(2007)
Greenland.....(2012)
Grenada.....(1902)
Guam.....(1994)
Guatemala.....(1976)
Guernsey.....(1879)
Guinea.....(2022)
Guyana.....(1895)
Haiti.....(1950)
Honduras.....(2000)
Hong Kong.....(1930)
Hungary.....(1924 and 1990)
Iceland.....(1895)
India.....(1882)
Indonesia.....(1894)
Ireland, Republic of (Eire).....(1880)
Isle of Man.....(1883)
Italy.....(1887)
Jamaica.....(1887)
Japan.....(1895)
Jersey.....(1879)
Kenya.....(1921)
Korea.....(1908)
Kuwait.....(2008)
Latvia.....(1923 and 1990)
Lesotho.....(1969)
Liberia.....(1988)
Lithuania....(2005)
Macau.....(2000)
Madagascar.....(2016)
Malawi.....(1967)
Malaysia.....(1938)
Mali.....(2008)
Marshall Islands.....(1985)
Mexico.....(1937)
Micronesia.....(1993)
Moldova.....(1994)
Mongolia.....(2008)
Mozambique.....(1916)
Myanmar.....(1915)
Namibia.....(1932 and 2008)
Nepal.....(2009)
Netherlands, The.....(1887)
New Zealand.....(1883)
Nicaragua.....(2010)
Nigeria.....(1920)
Norway.....(1888)
Pakistan.....(1883)
Panama.....(1904)
Papua New Guinea.....(1956)
Paraguay.....(1910)
Peru.....(1910)
Philippines, The.....(1937)
Poland.....(2005)
Portugal.....(1971)
Puerto Rico.....(1962)
Romania.....(1999)
Russia.....(1913 and 1991)
Rwanda.....(1995)
St Christopher Nevis (St Kitts).....(1904)
St Helena.....(1884)
St Lucia.....(1902)
St Maarten.....(1999)
St Vincent.....(1903)
Samoa.....(2018)
Sierra Leone.....(2010)
Singapore.....(1935)
Slovakia.....(2015)
Solomon Islands.....(2011)
South Africa.....(1883)
Spain.....(1971)
Sri Lanka.....(1883)
Suriname.....(1926)
Sweden.....(1882)
Switzerland.....(1882)
Taiwan.....(1965)
Tanzania.....(1933)
Thailand.....(2023)
Togo.....(2011)
Tonga.....(1986)
Trinidad & Tobago.....(1901)
Turks & Caicos.....(2011)
Uganda.....(1931)
Ukraine.....(1993)
United Arab Emirates.....(2010)
United Kingdom.....(1865)
United States of America.....(1880)
Uruguay.....(1890)
Venezuela.....(1972)
Virgin Islands.....(1917)
Zambia.....(1922)
Zimbabwe.....(1891)