Non-peer-reviewed, non-climate related and no abstract papers eliminated from analysis.
Year Papers
1991 145
1992 193
1993 180
1994 188
1995 248
1996 252
1997 283
1998 256
1999 313
2000 325
2001 372
2002 381
2003 486
2004 539
2005 619
2006 630
2007 881
2008 1154
2009 1379
2010 1493
2011 1627