|
| Années | Valeurs | Variations (%) ** |
| 1970 | 7,85 |
|
| 1971 | 7,76 |
-1,15 |
| 1972 | 7,49 |
-3,48 |
| 1973 | 8,18 |
9,21 |
| 1974 | 9,27 |
13,33 |
| 1975 | 10,78 |
16,29 |
| 1976 | 10,23 |
-5,10 |
| 1977 | 15,28 |
49,36 |
| 1978 | 11,29 |
-26,11 |
| 1979 | 8,86 |
-21,52 |
| 1980 | 10,49 |
18,40 |
| 1981 | 9,03 |
-13,92 |
| 1982 | 10,54 |
16,72 |
| 1983 | 10,28 |
-2,47 |
| 1984 | 9,30 |
-9,53 |
| 1985 | 9,61 |
3,33 |
| 1986 | 22,03 |
129,24 |
| 1987 | 14,29 |
-35,13 |
| 1988 | 10,00 |
-30,02 |
| 1989 | 12,51 |
25,10 |
| 1990 | 19,80 |
58,27 |
| 1991 | 15,61 |
-21,16 |
| 1992 | 18,37 |
17,68 |
| 1993 | 11,92 |
-35,11 |
| 1994 | 11,40 |
-4,36 |
| 1995 | 15,89 |
39,39 |
| 1996 | 14,61 |
-8,06 |
| 1997 | 16,22 |
11,02 |
| 1998 | 21,66 |
33,54 |
| 1999 | 13,37 |
-38,27 |
| 2000 | 14,25 |
6,58 |
| 2001 | 8,04 |
-43,58 |
| 2002 | 8,42 |
4,73 |
| 2003 | 12,88 |
52,97 |
| 2004 | 11,11 |
-13,74 |
| 2005 | 9,80 |
-11,79 |
| 2006 | 9,16 |
-6,53 |
| 2007 | 11,93 |
30,24 |
| 2008 | 11,48 |
-3,77 |
| 2009 | 12,26 |
6,79 |
| 2010 | 10,47 |
-14,60 |
| 2011 | 12,13 |
15,85 |
| 2012 | 27,98 |
130,67 |
| 2013 | 53,63 |
91,67 |
| 2014 | 36,46 |
-32,02 |
| 2015 | 12,09 |
-66,84 |
| 2016 | 12,40 |
2,56 |
| 2017 | 22,15 |
78,63 |
|
