1946	1946-1947	1947-1948	1948-1949	1949-1950
1950-1951	1951-1952	1952-1953	1953-1954	1954-1955
1955-1956	1956-1957	1957-1958	1958-1959	1959-1960
1960-1961	1961-1962	1962-1963	1963-1964	1964-1965
1965-1966	1966-1967	1967-1968	1968-1969	1969-1970
1970-1971	1971-1972	1972-1973	1973-1974	1974-1975
1975-1976	1976-1977	1977-1978 Var1	1977-1978 Var2	1977-1978 Var3
1978-1979 Var 1	1978-1979 Var 2	1979-1980	1980-1981	1981-1982 Var1
1981-1982 Var2	1982-1983	1983-1984	1984-1985	1985-1986
1986-1987 Var1	1986-1987 Var2	1987-1988	1988-1989	1989-1990
1990-1991	1991-1992	1992-1993	1993-1994	1994-1995
1995-1996	1996-1997	1997-1998	1998-1999	1999-2000
2000-2001	2001-2002	2002-2003	2003-2004	2004-2005
2005-2006	2006-2007	2007-2008	2008-2009	2009-2010
2010-2011	2011-2012

Pin variation explanations:
1977-1978 Variation 1: dark gold finish with large bumps.
1977-1978 Variation 2: dark gold with smoother finish with fine bumps.
1977-1978 Variation 3: light gold finish with large bumps.
1978-1979 Variation 1: Light Blue lake, pin has ridges.
1978-1979 Variation 2: Dark Blue lake, pin is smooth and emblem is round.
(Note: My pin is chipped in the yellow portions) 
1981-1982 Variation 1: flat island, logo, lettering, and clutch back pin.
1981-1982 Variation 2: raised island, logo, lettering and safety type pin.
1986-1987 Variation 1: light blue, flat island, logo, lettering, and made in Taiwan.
1986-1987 Variation 2: dark blue, raised island, logo & lettering.
According to Lion Verle's website there are other variations from 1978, 1982 & 1983

* If your scratching your head why I started at 1946, if the attendance awards started in 1927.
1. Supply and Demand, 1927-1945 are  very hard to find, every now and then they show up on E-bay but  go for big bucks.
There are two websites that show the 100% attendance pins in there entirety.
A free site Colorado Pin Traders and a pay site Lion Verle's Pin Emporium.
2. All pins are from my collection, and I have 8 years perfect attendance. BK