| Planning |
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Imperial County | 25.4% | 25.2% | 30.3% | 28.8% | 26.1% | 29.3% | 29.5% | 26.5% | 25.9% | 23.4% | 26.3% | 21.3% | 19.2% |
| California | 5.8% | 7.5% | 9.1% | 9.2% | 8.6% | 7.8% | 7.2% | 6.3% | 5.9% | 5.2% | 4.9% | 5.3% | 6.7% |
| U.S. | 5.6% | 6.8% | 7.5% | 6.9% | 6.1% | 5.6% | 5.4% | 4.9% | 4.5% | 4.2% | 4.0% | 4.8% | 5.8% |