Table:
text: List of Drum Corps International World Championship finalists
List of Drum Corps International World Championship finalists
List of Drum Corps International World Championship finalists
Corps_Name Number_of_Finals_Appearances Year_of_First_Appearance Year_of_Most_Recent_Appearance All_Years_of_Finals_Appearances
Santa Clara Vanguard 42 1972 2013 1972–2013
Blue Devils 40 1974 2013 1974–2013
The Cavaliers 40 1972 2013 1972,1974–77,1979–2013
Phantom Regiment 40 1974 2013 1974–2013
Madison Scouts 38 1973 2013 1973–2001,2003–06,2008,2010-2013
The Cadets 36 1975 2013 1975, 1977, 1980–2013
Bluecoats 26 1987 2013 1987-98,2000–2013
Crossmen 23 1977 2012 1977-78,1980–82,1984,1989–2004, 2012
Spirit of Atlanta 20 1978 2013 1978-88,1990,2002–03,2005–07,2011-13
Blue Knights 19 1991 2013 1991-94,1996–2000,2004–13
Carolina Crown 18 1995 2013 1995–2001,2003–13
Glassmen 16 1993 2010 1993-95,1997–2002,2004–10
Boston Crusaders 15 1999 2013 1999–2013
27th Lancers 12 1972 1984 1972-73,1975–84
Blue Stars 13 1972 2013 1972-79,2008–11,13
Bridgemen 10 1972 1983 1972-73,1976–83

text: List of Drum Corps International World Championship finalists
List of Drum Corps International World Championship finalists
List of Drum Corps International World Championship finalists
Corps_Name Number_of_Finals_Appearances Year_of_First_Appearance Year_of_Most_Recent_Appearance All_Years_of_Finals_Appearances
Freelancers 10 1976 1992 1976-77,1981–85,1989,1991–92
Star of Indiana 9 1985 1993 1985-93
Colts 8 1993 2007 1993-96,1998–99,2001,2007
Troopers 9 1972 2009 1972-75,1979,1981,1985–86,2009
Velvet Knights 8 1984 1992 1984-90,1992
Suncoast Sound 7 1983 1989 1983-89
Kilties 6 1972 1978 1972-75,1977–78
The Magic 6 1994 2003 1994–1997,2002–03
Sky Ryders 6 1982 1991 1982-83,1986–88,1991
Guardsmen 4 1976 1980 1976, 1978–80
Anaheim Kingsmen 3 1972 1974 1972-74
Muchachos 3 1972 1974 1972-74
North Star 3 1978 1980 1978-80
Argonne Rebels 2 1972 1973 1972-73
Oakland Crusaders 2 1975 1976 1975-76
Seneca Optimists 2 1976 1977 1976-77
Bleu Raeders 1 1972 1972 1972
Black Knights 1 1973 1973 1973

Question: Among the finalists on the Drum Corps International World Championship list who made their first appearance after 1976, what is the average year of the last appearance of the Boston Crusaders?