Passage: Subsequent annual summits of the Shanghai Five group occurred in Almaty, Kazakhstan in 1998, in Bishkek, Kyrgyzstan in 1999, and in Dushanbe, Tajikistan in 2000. At the Dushanbe summit, members agreed to "oppose intervention in other countries' internal affairs on the pretexts of 'humanitarianism' and 'protecting human rights;' and support the efforts of one another in safeguarding the five countries' national independence, sovereignty, territorial integrity, and social stability."In 2001, the annual summit returned to Shanghai. There the five member nations first admitted Uzbekistan in the Shanghai Five mechanism (thus transforming it into the Shanghai Six). Then all six heads of state signed on 15 June 2001 the Declaration of Shanghai Cooperation Organisation, praising the role played thus far by the Shanghai Five mechanism and aiming to transform it to a higher level of cooperation.

Question: What year was the Declaration signed?
15 June 2001