The table below gives the annual sales (in millions of dollars per year) of a product.
What was the average rate of change of annual sales
a) Between 2000 and 2001
 millions of dollars/year
b) Between 2000 and 2005
 millions of dollars/year
| year | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 |
|---|---|---|---|---|---|---|---|---|---|
| sales | 129 | 174 | 209 | 234 | 249 | 254 | 249 | 234 | 209 |
What was the average rate of change of annual sales
a) Between 2000 and 2001
 millions of dollars/year
b) Between 2000 and 2005
 millions of dollars/year
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