what was the middle class salary of the following years?

Question

1990-91
1991-92
1992-93
1993-94
1994-95
1995-96
1996-97
1997-98
1998-99
1999-00
2000-01
2001-02
2002-03
2003-04
2004-05
2005-06
2006-07

Answer 1

Here is a chart showing median household income, which would mean that half the population earns more than a certain amount and the other half earns less:

http://www.census.gov/hhes/www/income/medhhinc.html

Answer 2

The first answer is good ... if what you want is household incomes in 2006 dollars.

If you want something other than household incomes I suggest you go to

http://www.census.gov/hhes/www/income/histinc/histinctb.html

for families or people instead of households.

If you want household incomes in dollars as of the year being reported, then

http://www.census.gov/hhes/www/income/histinc/h11ar.html

is probably more appropriate. The difference can be significant, as you can see. For example, in 1990 the median income of $29,943 is equivalent to $43,366 in 2005 dollars.