# Values for Citations_by-year.txt 
#  BIN (year) Citations to Refereed Chandra Science Papers (Num. of Papers)
         2000       4797              61
         2001      12363             222
         2002      14677             356
         2003      14630             482
         2004      11027             487
         2005       9459             509
         2006       7345             550
         2007       3448             489
         2008        635             347