here's what we have. (unfortunately, a lot of the older charts have been forever lost.)

2006:

• february
  
• march
  
• april
  
• september
  
• october
  
• november
  
• december
  

2005:

• march
  
• april
  
• october
  
• november
  
• december
  

2000:

• march weeks 1  2  3
• april weeks 1  2

1999:

• october
  
• november
  
• december
  

1998:

• january
  
• february
  
• march
  
• april
  
• september
  
• october
  
• november
  

1997:

• june
  
• july + august
  
• september
  
• october
  
• november
  
• december