2017         2016          2015          2014          2013          2012          2011           2010         
                  

                      December                             December        November     December       December       December
                      October          October          October            August          November       April                 November
                                            September      May                 June              September      February          October
                      July                August            April                                      July
 April             June               July                 March                                   June
 March          January          April                January                                 May
 February                            March                                                           February
January                              January                                                        January