opened for signature - November 18 1991
entered into force - September 29 1997
parties - (21) Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Italy, Liechtenstein, Luxembourg, Monaco, Netherlands, Norway, Slovakia, Spain, Sweden, Switzerland, United Kingdom
countries that have signed, but not yet ratified - (6) Canada, European Union, Greece, Portugal, Ukraine, United States