Fascinating set of figures.
And watch what happens if you take the base price of $28 in 1984 and roll it forward using the CPI index - (third column)
Actual CPI adj.
1984 $28
1988 $15 -46% $46
1990 $23 +53% $51
1994 $16 -30% $55
1996 $20 +25% $58
1998 $12 -40% $60
2000 $27 +125% $61
2002 $23 -23% $65
2008 $147 +539% $76 (qtr 1)
2008 $115 -22% $77