# Values for Citations_by-year.txt 
#  BIN (year) Citations to Refereed Chandra Science Papers (Num. of Papers)
         2000       5932              56
         2001      15322             199
         2002      19499             331
         2003      21242             437
         2004      16028             396
         2005      17786             480
         2006      20304             547
         2007      15728             491
         2008      13488             525
         2009       9585             431
         2010       6918             419
         2011       4571             429
         2012       1974             442
        TOTAL     168377            5183