| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| 20.8 | 20.8 | 20.9 | 21.0 | 21.0 | 21.0 | 21.0 | 21.0 | 20.8 | 20.8 | 20.9 |
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| 20.3 | 20.2 | 20.3 | 20.3 | 20.4 | 20.5 | 20.5 | 20.5 | 20.2 | 20.3 | 20.4 |
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| 20.2 | 20.2 | 20.2 | 20.6 | 20.8 | 20.7 | 20.7 | 20.7 | 20.6 | 20.6 | 20.7 |
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| 21.2 | 21.3 | 21.3 | 21.3 | 21.4 | 21.4 | 21.4 | 21.3 | 21.1 | 21.2 | 21.3 |
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| 20.9 | 21.0 | 21.1 | 21.1 | 21.1 | 21.0 | 21.0 | 21.0 | 20.8 | 20.8 | 20.9 |
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | |
| Males | 20.9 | 21.0 | 21.0 | 21.1 | 21.2 | 21.1 | 21.2 | 21.1 | 20.9 | 21.0 | 21.0 |
| Females | 20.7 | 20.7 | 20.8 | 20.8 | 20.9 | 20.9 | 20.9 | 20.9 | 20.7 | 20.8 | 20.9 |
| African American/Black | 17.1 |
| American Indian/Alaska Native | 18.8 |
| Caucasian American/White | 21.8 |
| Mexican American/Chicano | 18.4 |
| Asian American/Pacific Islander | 21.9 |
| Puerto Rican/Hispanic | 18.8 |
| Other | 19.4 |
| Multiracial | 20.9 |
| Prefer not to respond | 22.0 |
| No response | 20.7 |
| 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 |
| 57.1 | 59.5 | 60.5 | 61.0 | 63.1 | 62.6 | 63.2 | 63.6 | 61.8 | 61.9 | 62.0 |