A referendum can also occur at the provincial level. The 1980 and 1995 referendums on the secession of Québec are notable cases. In conjunction with the provincial election in 2007, the province of Ontario voted on a mixed-member proportional representation electoral system and British Columbia held two consecutive referendums on BC-STV in 2005 and 2009. In 2011 British Columbia held yet another referendum against a newly imposed HST tax. The results ended up making British Columbia the first province to overturn the harmonization of provincial and federal taxes, joining it with Alberta, which not having a provincial sales tax, has never participated in the HST. A referendum was held in the Canadian province of Prince Edward Island on November 28, 2005 to determine whether or not to adopt the Mixed Member Proportional Representation System. The referendum failed.