"Figure 4: Percentage of Highway Bridges with Deficiencies, 1992-2006",,
Year,% Structurally deficient,% Functionally obsolete
1992,20.7%,14.0%
1993,19.4%,13.9%
1994,18.7%,13.9%
1995,17.8%,13.9%
1996,17.4%,14.0%
1997,16.9%,13.3%
1998,16.0%,13.6%
1999,15.1%,14.0%
2000,14.8%,13.8%
2001,14.2%,13.8%
2002,13.8%,13.8%
2003,13.5%,13.7%
2004,13.1%,13.6%
2005,12.8%,13.5%
2006,12.4%,13.4%
"NOTE: Bridges that are both structurally deficient and functionally obsolete are classified as structurally deficient.  Numbers include the 50 U.S. states, the District of Columbia, and Puerto Rico.",,
"SOURCES: U.S. Department of Transportation, Federal Highway Administration, National Bridge Inventory, Deficient Bridges by State and Highway System, various years, available at http://www.fhwa.dot.gov/bridge/britab.htm as of Aug. 14, 2007.",,