An Economy's Consumer Price Index (CPI) Is Described by the Function

An economy's consumer price index (CPI) is described by the function , where corresponds to 1995.
At what rate was the CPI changing in 1999?
__________ pts/yr
At what rate was the CPI changing in 2002?
__________ pts/yr
At what rate was the CPI changing in 2005?
__________ pts/yr
What was the average rate of increase in the CPI over the period from 1999 to 2005?
__________ pts/yr