title: Getting the quarter where recession start and recession ends along with the quarter of minimum gdp
body: <pre><code>Quarter:    GDP:   GDP change:  change
  1999q3     9           --         ------
  1999q4    10           1          increase
  2000q1     9          -1          decline
  2000q2     8          -1          decline
  2000q3     7          -1          decline
  2000q4     6          -1          decline
  2001q1     8           1          increase
  2001q2     11          3          increase
  2001q3     12          1          increase
  </code></pre>
  
  <p>Here is the Processed dataFrame Now I need separate list of all the quarters in which recession starts ,recession ends and bottom of recession</p>
  
  <p>The start of recession in the example above is '2000q1'because the GDP decline started then</p>
  
  <p>recession end is ''2001q2'</p>
  
  <p>recession bottom is '2000q4' because it has the minimum GDP between start and end </p>