Amiga had its golden age in the late 80's to early 90's. There are some interesting sales figures in a thread on Amiga.org.|
Someone pointed out to this page giving the Personal Computer market share from 1975 to 2002 (Including the Amiga, Atari, Commodore, Apple II).
There is also this page giving recent figures on google usage by platfom (Unfortunately Amiga is in the "other" category).
It looks that in 1991 Amiga reached 5% of the market share.
1.000.000 units sold in 2004 would represent less than 1% of the market share.
Just to give an idea on how the current sales figures of the Pegasos or Amigaone compares: They are actualy around 500 times less (less than 0.002 % of the market).
The desktop market is completely dominated by Microsoft. The alternative systems (including Apple and linux Desktops) have 5-6%.
Surprisingly (at least for me) Linux is almost invisible on the graphs.