# Values for Citations_by-year.txt 
#  BIN (year) Citations to Refereed Chandra Science Papers (Num. of Papers)
         2000       4835              61
         2001      12481             222
         2002      14914             356
         2003      14971             482
         2004      11412             487
         2005       9919             509
         2006       7924             550
         2007       3985             489
         2008       1024             410