# Values for Citations_by-year.txt 
#  BIN (year) Citations to Refereed Chandra Science Papers (Num. of Papers)
         2000       5355              61
         2001      14130             222
         2002      17119             356
         2003      17813             482
         2004      14247             487
         2005      13104             509
         2006      11739             551
         2007       7322             490
         2008       4559             535
         2009       1066             327