Question: How many times have teams that are part of the league that gives out the Brad Hornung Trophy won the Memorial Cup?

Context paragraphs:
2000 Memorial Cup: The 2000 Memorial Cup occurred May 20–28 at the Halifax Metro Centre in Halifax, Nova Scotia.  It was the 82nd annual Memorial Cup competition and determined the major junior ice hockey champion of the Canadian Hockey League (CHL).  It featured the host team, the Halifax Mooseheads as well as the winners of the Ontario Hockey League, Quebec Major Junior Hockey League and the Western Hockey League which were the Barrie Colts, Rimouski Océanic and the Kootenay Ice respectively.  The 2000 Memorial Cup was the first ever to be played in Atlantic Canada.  The Rimouski Océanic won their first Memorial Cup, beating the Barrie Colts in the final.  The Colts in particular made the 2000 Memorial Cup a controversial one, due to the presence of numerous players on their team who were clients of the rogue sports agent David Frost, including future murder-for-hire suspect Mike Danton.

1986 Memorial Cup: The 1986 Memorial Cup occurred May 10–17 at the Memorial Coliseum in Portland, Oregon.  It was the 68th annual Memorial Cup competition and determined the major junior ice hockey champion of the Canadian Hockey League (CHL).  Hosting rights were originally awarded to the Queen's Park Arena and the New Westminster Bruins, but staging the tournament alongside Expo '86 in Vancouver proved logistically impossible and so the tournament was moved to Portland for the second time in three years.  Participating teams were the host team Portland Winter Hawks, as well as the winners of the Western Hockey League, Ontario Hockey League and Quebec Major Junior Hockey League which were the Kamloops Blazers, Guelph Platers and Hull Olympiques.  The Platers won their first Memorial Cup, and the city's second Memorial Cup, defeating Hull in the final game.

1972 Memorial Cup: The 1972 Memorial Cup occurred May 8–14 at the Ottawa Civic Centre in Ottawa, Ontario, Canada.  It was the 54th annual Memorial Cup competition, organized by the Canadian Amateur Hockey Association (CAHA) to determine the champion of major junior A ice hockey.  Participating teams were the winners of the Ontario Hockey Association, Quebec Major Junior Hockey League and Western Hockey League which were the Peterborough Petes, Cornwall Royals and Edmonton Oil Kings.  Cornwall won their 1st Memorial Cup, defeating Peterborough in the final game.  1972 was the first year the Memorial Cup was contested as a round robin tournament between three teams.

1947 Memorial Cup: The 1947 Memorial Cup final was the 29th junior ice hockey championship of the Canadian Amateur Hockey Association.  The George Richardson Memorial Trophy champions Toronto St. Michael's Majors of the Ontario Hockey Association in Eastern Canada competed against the Abbott Cup champions Moose Jaw Canucks of the Southern Saskatchewan Junior Hockey League in Western Canada.  The series was a rematch of the 1945 Memorial Cup, and featured the first Memorial Cup games played in the province of Saskatchewan.  In a best-of-seven series, held at Shea's Amphitheatre in Winnipeg, Manitoba, Regina Exhibition Stadium in Regina, Saskatchewan, and at the Moose Jaw Arena in Moose Jaw, Saskatchewan, St. Michael's won their 3rd Memorial Cup, defeating Moose Jaw 4 games to 0.

2006 Memorial Cup: The 2006 Memorial Cup was held in Moncton, New Brunswick, from May 19–28.  It was the 88th annual Memorial Cup competition and determined the major junior ice hockey champion of the Canadian Hockey League (CHL).  The host team Moncton Wildcats were the only team guaranteed a spot in the tournament.  The other teams were the champions of the Ontario Hockey League (OHL), the Peterborough Petes; the Western Hockey League (WHL) champions, the Vancouver Giants; and the Quebec Major Junior Hockey League (QMJHL)'s Quebec Remparts, who were runners-up in the QMJHL final to the champion Wildcats.  The Remparts won the Memorial Cup, defeating the Wildcats 6–2 in the first all-QMJHL final in tournament history.  It also marked the first time in Memorial Cup history that the winning team was neither the host nor a league champion.

2013 Memorial Cup: The 2013 Memorial Cup was a four-team, round-robin format ice hockey tournament played from May 17–26, 2013.  It was the 95th Memorial Cup championship and determined the champion of the Canadian Hockey League (CHL).  The tournament featured the London Knights, champions of the Ontario Hockey League, the Halifax Mooseheads, champions of the Quebec Major Junior Hockey League, the Portland Winterhawks, champions of the Western Hockey League, and the Saskatoon Blades, who won the right to host the tournament over bids by the Kelowna Rockets and the Red Deer Rebels.  This was the first Memorial Cup to be held in Saskatoon since the Blades hosted it in 1989.  The Halifax Mooseheads won the Memorial Cup for the first time in franchise history, beating the Portland Winterhawks 6-4 in the final.  The Halifax Mooseheads joined the Saint John Sea Dogs in 2011, and the Shawinigan Cataractes in 2012, as the third straight team from the QMJHL to capture the trophy.

Western Hockey League: The Western Hockey League (WHL) is a major junior ice hockey league based in Western Canada and the Northwestern United States.  The WHL is one of three leagues that constitute the Canadian Hockey League (CHL) as the highest level of junior hockey in Canada.  Teams play for the Ed Chynoweth Cup, with the winner moving on to play for the Memorial Cup, Canada's national junior championship.  WHL teams have won the Memorial Cup 19 times since the league became eligible to compete for the trophy.

Memorial Cup: The Memorial Cup (Coupe Memorial in French) is a junior ice hockey club championship trophy awarded annually to the Canadian Hockey League (CHL) champion.  It is awarded following a four-team, round-robin tournament between a host team and the champions of the CHL's three member leagues: the Ontario Hockey League (OHL), Quebec Major Junior Hockey League (QMJHL) and Western Hockey League (WHL).  Sixty teams are eligible to compete for the Memorial Cup, representing nine provinces and four American states.  The Windsor Spitfires are the current champions, winning in the final game against the OHL champion Erie Otters.  The Memorial Cup, often referred to by fans as "The Memmer", is known as one of the toughest sporting trophies to win, due to 60 teams participating and the age limit only being 16-21.

1966 Memorial Cup: The 1966 Memorial Cup was the 48th annual Memorial Cup competition, organized by the Canadian Amateur Hockey Association (CAHA) to determine the champion of "junior A" ice hockey.  The George Richardson Memorial Trophy champions Oshawa Generals of the Ontario Hockey Association in Eastern Canada competed against the Abbott Cup champions Edmonton Oil Kings of the Central Alberta Hockey League in Western Canada.  Maple Leaf Gardens in Toronto, Ontario hosted the Final, which featured Bobby Orr, the Generals captain.  It was the last of 18 Memorial Cup series to be played at the Gardens.  In a best-of-seven series, Edmonton won their second Memorial Cup, defeating Oshawa four games to two.  Orr was injured and played sparingly.

Brad Hornung Trophy: The Brad Hornung Trophy is awarded annually to the most sportsmanlike player of the Western Hockey League.  First presented in 1967, it was later renamed in honour of former Regina Pats player Brad Hornung who was paralyzed during a game on March 1, 1987.

Supporting paragraphs: Brad Hornung Trophy Western Hockey League
Answer: 19