Consider the following data regarding the number of returned products for a large online retailer, by month, for the years $2003$ and $2011.$

Number of Returned Products in $2003$ and $2011$

Month $20032011$

January $51$

$100$

February $70$

$115$

March $67$

$106$

April $85$

$109$

May $93$

$117$

June $97$

$113$

July $95$

$121$

August $111$

$132$

September $117$

$127$

October $118$

$131$

November $127$

$142$

December $131$

$153$

Step $3$ of $3$ : Has the retailer improved the process from $2003$ to $2011?$