| Year | Annual concentration (percent) |
|---|---|
|
1990 |
15.3 |
|
1991 |
14.9 |
|
1992 |
14.5 |
|
1993 |
14.0 |
|
1994 |
13.7 |
|
1995 |
13.4 |
|
1996 |
13.1 |
|
1997 |
12.9 |
|
1998 |
12.6 |
|
1999 |
12.1 |
|
2000 |
11.7 |
|
2001 |
11.2 |
|
2002 |
10.4 |
|
2003 |
9.8 |
|
2004 |
9.5 |
|
2005 |
9.2 |
|
2006 |
8.9 |
|
2007 |
8.7 |
|
2008 |
8.4 |
|
2009 |
7.8 |
|
2010 |
7.5 |
|
2011 |
7.5 |
|
2012 |
7.4 |
|
2013 |
7.2 |
|
2014 |
7.1 |
|
2015 |
7.0 |
|
2016 |
6.9 |
|
2017 |
6.8 |
|
2018 |
6.8 |
|
2019 |
6.8 |
|
Note: Between 1990 and 2019, there were three recessions: July 1990–March 1991, January 2001–November 2001, and December 2007–June 2009. Recession start and end dates are determined by the National Bureau of Economic Research. Source: U.S. Bureau of Labor Statistics. |
|