| Year | Inbound | Outbound | Total |
|---|---|---|---|
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| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
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| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
| - | - | - | - |
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Source
Release date
November 2010
Region
United States
Survey time period
1990 to 2009
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