| Year | Washington | New York | Los Angeles | Houston | Total |
| 1426/ 2006 | 4,694 | 5,878 | 2,732 | 187 | 13,491 |
| 1425/2005 | 4,225 | 5,338 | 2,992 | 195 | 12,750 |
| 1424/2004 | 3,236 | 4,996 | 2,292 | 193 | 10,717 |
| 1423/2003 | 3,618 | 5,593 | 2,100 | 225 | 11,536 |
| 1422/2002 | 1,819 | 4,600 | 2,200 | 361 | 8,980 |