| 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WEST | 0.50 | 0.48 | 0.83 | 1.96 | 2.39 | 3.20 | 2.62 | 2.92 | 2.75 | 3.95 | 6.51 | 6.31 | 7.44 | 7.40 | 7.34 |
| CENTRE | 0.68 | 2.06 | 2.95 | 4.32 | 6.56 | 8.74 | 5.37 | 6.75 | 7.21 | 8.06 | 8.42 | 8.89 | 9.10 | 10.74 | 12.05 |
| EAST | 0.13 | 0.38 | 0.44 | 0.45 | 0.50 | 0.89 | 0.94 | 1.99 | 4.25 | 4.32 | 6.08 | 6.52 | 6.70 | 9.10 | 6.38 |