Tier 1 Capital Ratio Over Time
Tier 1 Capital Ratio Northern Trust Bank Of California National Association All Insured Commercial Banks in California
09-30-2006 11.8 19.397
06-30-2006 11.68 17.22
03-31-2006 12.28 17.258
12-31-2005 11.76 17.882
09-30-2005 11.35 16.454
06-30-2005 10.81 15.701
03-31-2005 10.81 14.977
12-31-2004 10.39 14.478
09-30-2004 10.56 14.639
06-30-2004 10.95 14.582
03-31-2004 11.15 15.416
12-31-2003 10.93 15.254
09-30-2003 10.97 14.407
06-30-2003 11.21 14.01
03-31-2003 11.6 13.498
12-31-2002 11 13.579