| exhibit 12 | ||||||
| LMI Tract | LMI Tract | LMI Tract | total LMI | total LMI | total LMI | |
| Year | top 25 | large | small | top 25 | large | small |
| 1990 | 12.56 | 10.27 | 8.32 | 21.70 | 22.32 | 21.54 |
| 1991 | 10.06 | 8.55 | 7.31 | 21.04 | 20.97 | 20.57 |
| 1992 | 8.80 | 7.64 | 7.70 | 20.00 | 19.02 | 20.98 |
| 1993 | 8.43 | 7.50 | 7.63 | 22.57 | 21.55 | 21.23 |
| 1994 | 10.39 | 9.10 | 9.39 | 27.33 | 26.12 | 26.01 |
| 1995 | 10.15 | 9.46 | 9.81 | 26.31 | 25.71 | 26.05 |
| 1996 | 9.52 | 9.26 | 9.54 | 26.07 | 25.77 | 26.27 |
| 1997 | 9.43 | 9.51 | 10.24 | 25.47 | 26.56 | 28.35 |
| 1998 | 8.73 | 8.49 | 8.68 | 24.58 | 24.50 | 25.34 |
| 1999 | 10.80 | 10.75 | 9.80 | 29.40 | 30.73 | 29.04 |
| 2000 | 12.80 | 12.26 | 11.39 | 32.82 | 32.43 | 31.62 |
| 2001 | 10.51 | 10.24 | 9.24 | 27.91 | 28.00 | 28.04 |
| 2002 | 9.72 | 9.68 | 9.14 | 27.16 | 28.01 | 28.79 |
| 2003 | 11.23 | 11.55 | 9.19 | 26.64 | 29.29 | 29.26 |
| 2004 | 15.56 | 15.63 | 14.27 | 33.27 | 34.56 | 38.19 |
| 2005 | 16.34 | 16.85 | 14.74 | 32.74 | 34.05 | 37.53 |
| 2006 | 17.66 | 18.23 | 15.89 | 33.54 | 35.30 | 37.91 |
| 2007 | 17.48 | 16.39 | 15.90 | 32.97 | 33.89 | 36.29 |