Update: 2015-03-23
year mio oz t % 1989 527.3 16400 0.00 1990 533.7 16600 1.22 1991 501.6 15600 -6.02 1992 479.0 14900 -4.49 1993 453.3 14100 -5.37 1994 450.1 14000 -0.71 1995 479.0 14900 6.43 1996 485.5 15100 1.34 1997 530.5 16500 9.27 1998 553.0 17200 4.24 1999 549.8 17100 -0.58 2000 581.9 18100 5.85 2001 601.2 18700 3.31 2002 604.4 18800 0.53 2003 604.4 18800 0.00 2004 643.0 20000 6.38 2005 668.7 20800 4.00 2006 652.7 20300 -2.40 2007 675.2 21000 3.45 2008 684.8 21300 1.43 2009 700.9 21800 2.35 2010 742.7 23100 5.96 2011 749.1 23300 0.87 2012 819.8 25500 9.44Source: USGS