of these approaches; the relevant regulations outline the use of instant-runoff voting where a single representative is to be elected and STV where multiple representatives are to be elected. As of the 2018 Ontario municipal elections, only one council, that of the City of London, will be elected using a ranked-choice ballot. As London exclusively uses single-member districts, its election will be instant-runoff voting and not STV. The next opportunity for a municipality to potentially adopt STV will be the 2022 Ontario municipal elections. Saskatchewan The city of Saskatoon used STV for its municipal elections 1920-1930 and 1938–1942. As well, Regina, Moose Jaw and North Battleford also used the system in the early 1920s. Estonia The system was used once: for the 18 March 1990 Estonian Supreme Soviet election, which was one of the four elections between 1989 and 1992 in the process that led to the independence of Estonia from the Soviet Union. The local elections in December 1989 were also held with this system, which served as a dress rehearsal with the law finally enacted on 4 December 1989. The choice of STV was the result of a debate on voting systems led by the influential Estonian political scientist and émigré Rein Taagepera, who penned articles in Edasi in 1988, published Seats and Votes in 1989, and gave conferences on the topic. STV was not, however, Taagepera's own preference, but was rather the result of a consensus driven by Peet Kask between the outgoing Communist local officials, who sought a system that favored their popular names over their unpopular party brand, and the principle of proportional representation favored by the new parties. The electoral system has been praised as a factor of political moderation that helped accommodate Russians in Estonia into the new political structure. However, just before the Constitution of Estonia was enacted in 1992, a new electoral law was passed on 20 April 1992 for the recreated Riigikogu, choosing instead an open party list proportional representation system with a 5% threshold, similar to many other countries of continental Europe. The ACE Electoral Knowledge Network cites the "complex intricacies of an STV count" as one of the reasons for the change. Hong Kong For the 1995 election of Hong Kong's 60-member Legislative Council, STV was used to elect the 10-member Election Committee constituency. Following the 1997 transfer to Chinese sovereignty, the method changed to plurality-at-large voting. Hungary