A potential Toronto bid to host the 2024 Summer Olympics would be far from a sure thing, as Canada’s history of bidding for the Olympics has shown.

Canadian Olympic Committee President Marcel Aubut confirmed on Saturday that he would support a Toronto bid to host the 2024 Summer Olympics. And with nearly 1.1 million tickets sold at the 2015 Pan Am Games in Toronto, the city seems to be in a good position to become an Olympic host.

But what are the chances of Toronto’s bid being successful? A history of Canada’s ambitions to host the Olympics shows that placing a bid is very far from a guarantee.

Here’s a timeline of Canadian cities’ past attempts to host the prestigious sporting event.

1932: Montreal was the first Canadian city to place a bid to host the Winter Olympics. The Games, however, were awarded to Lake Placid, N.Y. in 1932. Undeterred, Montreal unsuccessfully bid for the Games three more times, in 1936, 1944 and 1956.

1964: After Montreal’s lack of success, Calgary took over the Great White North’s ambitions to host the Winter Olympics. Just as Montreal fell short, Calgary also failed in its first try, losing out to Innisbruck, Austria. Calgary also submitted bids for the Winter Games in 1968 and 1972, only to be voted second choice by the International Olympic Committee on both occasions.

1972: Montreal bid to host the Summer Olympics, but received fewer IOC votes than both Munich and Madrid.

1976: Montreal’s successful bid for the Summer Olympics marked the first time a Canadian city ever hosted an Olympic Games. That same year, Vancouver bid to host the Winter Olympics, but was unsuccessful.

1980: Vancouver was one of only two cities aspiring to host the Winter Olympics. The Games, however, were awarded to its only rival, Lake Placid, N.Y.

1988: After three unsuccessful bids, Calgary finally won the chance to host the Winter Olympics, held in 1988. Canada placed 13th in the Games and didn’t win any gold medals.

1996: Toronto bid to host the Summer Olympics, but came in third place after five rounds of voting. The city had been dropped from the list of contenders vying to host the Olympics three times before this bid. Toronto also submitted an unsuccessful bid to host the Summer Olympics in 2008.

2002: Quebec City submitted its first and only bid to host the Winter Olympics, but those Games were held in Salt Lake City, Utah.

2010: Vancouver hosted the Winter Olympics. These were also Canada’s most successful Olympics. The country ranked first with 14 gold medals.

In total, Canadian cities have submitted 17 bids to host the Olympics—only three of which have been successful. According those figures, Toronto has just under a one-in-five chance of hosting the Games in 2024.

And the competition is fierce. Toronto will have to beat out Boston, Budapest, Paris, Hamburg and Rome in order to host the sporting event.

The IOC will officially announce the host of the Games in 2017.