|
| Années | Valeurs | Variations (%) ** |
| 1987 | 36,11 |
|
| 1988 | 21,85 |
-39,49 |
| 1989 | 33,72 |
54,32 |
| 1991 | 18,56 |
-44,96 |
| 1992 | 24,59 |
32,49 |
| 1993 | 21,89 |
-10,98 |
| 1994 | 22,92 |
4,71 |
| 1995 | 23,28 |
1,57 |
| 1996 | 29,37 |
26,16 |
| 1997 | 14,58 |
-50,36 |
| 1998 | 3,76 |
-74,21 |
| 1999 | 14,64 |
289,36 |
| 2000 | 28,84 |
96,99 |
| 2001 | 19,31 |
-33,04 |
| 2002 | 17,42 |
-9,79 |
| 2003 | 17,26 |
-0,92 |
| 2004 | 20,06 |
16,22 |
| 2005 | 23,93 |
19,29 |
| 2006 | 19,47 |
-18,64 |
| 2007 | 19,79 |
1,64 |
| 2008 | 20,72 |
4,70 |
| 2009 | 9,46 |
-54,34 |
| 2010 | 11,48 |
21,35 |
| 2011 | 15,02 |
30,84 |
| 2012 | 12,73 |
-15,25 |
| 2013 | 10,53 |
-17,28 |
| 2014 | 8,93 |
-15,19 |
| 2015 | 5,10 |
-42,89 |
| 2016 | 3,71 |
-27,25 |
| 2017 | 5,02 |
35,31 |
|
