1982 - $3,215.25
1983 - $1,843.91 vs Jun 09
1984 - $1,451.91
1986 - $1,459.31
1988 - $1,463.80
1989 - $2,029.24 (NGC MS69)
1991 - $1,487.77
1992 - $2,028.88
1994 - $1,513.57
1995 - $2,597.31 (NGC MS69)
1996 - $1,908.90 (NGC MS69)
1997 - $1,566.26
1998 - $1,695.36
2000 - $1,429.54
2004 - $1,585.80
2005 - $1,506.08
2008 - $1,187.23
2009 - $1,722.88
Transactions for 1982 is worth a mention. MS67 was transacted higher than AU58 by more than $600 at $3,051.38. Still, the slab is worth buying since it has been authenticated. For 1982, authentication is important as it does not have face value.
On the other hand, 1983 slab was transacted higher than sealed. PCGS MS69 was higher than NGC MS69 by nearly $500.