(The numbers of locations as of October 1 are given.)

The number N of locations of a popular coffeehouse chain is given in the table. (The numbers of locations as of October 1 are given.)

Year 2004 2005 2006 2007 2008
N 8575 10,244 12,443 15,007 16,678

(a) Find the average rate of growth between each pair of years.

2004 to 2006  locations/year
2006 to 2007  locations/year
2005 to 2006  locations/year