| Year |
Result |
Note |
| 2001 |
72.3 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2002 |
70.4 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2003 |
74.6 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2004 |
79.9 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2005 |
80.4 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2006 |
78.7 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2007 |
79.9 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2008 |
80.6 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2009 |
82.3 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2010 |
80.5 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2011 |
81.8 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2012 |
78.3 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2013 |
79.7 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2014 |
77.3 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year |
| 2015 |
80.9 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year |
| 2016 |
79.0 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year |
| 2017 |
85.3 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year |
| 2018 |
84.1 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2019 |
85.4 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2020 |
|
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. Test sample not taken in CY2020 due to COVID-19 pandemic. |
| 2021 |
81.7 |
This is a shared measure with the Virginia Department of Transportation. Data is provided by Old Dominion University from a test sample in June of each year. |
| 2022 |
|
|