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.
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At what rate was the CPI changing in 1997?
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__________ pts/yr
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At what rate was the CPI changing in 2004?
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__________ pts/yr
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At what rate was the CPI changing in 2005?
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__________ pts/yr
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What was the average rate of increase in the CPI over the period from 1997 to 2005?
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__________ pts/yr