For the historians out there, here is a complete breakdown of the previous winners.
GRAMMAR (14)
1897-98-99, 1915-16, 1919-20-21-22, 1924*, 1929, 1949*, 1966-67
HIGH (5)
1946*, 1963, 1971-72*73
KINGS (28)
1890-91-92-93-94-95, 1901-02-03, 1910, 1913-14, 1917, 1924*, 1926-27*-28, 1934, 1951, 1954, 1961*, 1974, 1978*, 1997-98*-99, 2000, 2002, 2008*-09*
NEWINGTON (9)
1896, 1900, 1911-12, 1953, 1961*, 1979, 2010, 2012
SCOTS (6)
1948*-49*, 1959, 1978*, 1987, 1993
SHORE (8)
1908-09, 1933*, 1969, 1970*, 1977*, 1998*, 2006*
ST IGNATIUS (9)
1964, 1972*, 1975, 1980, 1996, 2003, 2006*, 2008*-09*, 2011
ST JOSEPHS (53)
1904-05-06-07, 1918, 1923-24*-25, 1927*, 1930-31-32-33*, 1935-36-37-38-39, 1946*-47-48*, 1950, 1952, 1955-56-57-58, 1960, 1962, 1965, 1968, 1970*, 1976, 1977*-78*, 1981-82-83-84-85-86, 1988-89-90-91-92, 1994-95, 1998*, 2001, 2004-05-06*-07,
2013????
* Denotes shared
1939-1945 Not played