|
| Années | Valeurs | Variations (%) ** |
| 1970 | 10,17 |
|
| 1971 | 6,63 |
-34,81 |
| 1972 | 5,82 |
-12,22 |
| 1973 | 7,38 |
26,80 |
| 1974 | 11,15 |
51,08 |
| 1975 | 13,25 |
18,83 |
| 1976 | 12,88 |
-2,79 |
| 1977 | 8,80 |
-31,68 |
| 1978 | 7,56 |
-14,09 |
| 1979 | 9,46 |
25,13 |
| 1980 | 8,78 |
-7,19 |
| 1981 | 5,63 |
-35,88 |
| 1982 | 6,71 |
19,18 |
| 1983 | 9,22 |
37,41 |
| 1984 | 8,12 |
-11,93 |
| 1985 | 9,06 |
11,58 |
| 1986 | 7,08 |
-21,85 |
| 1987 | 8,60 |
21,47 |
| 1988 | 11,87 |
38,02 |
| 1989 | 12,82 |
8,00 |
| 1990 | 11,16 |
-12,95 |
| 1991 | 9,13 |
-18,19 |
| 1992 | 7,58 |
-16,98 |
| 1993 | 5,91 |
-22,03 |
| 1994 | 6,94 |
17,43 |
| 1995 | 8,03 |
15,71 |
| 1996 | 6,57 |
-18,18 |
| 1997 | 6,56 |
-0,15 |
| 1998 | 4,80 |
-26,83 |
| 1999 | 5,69 |
18,54 |
| 2000 | 7,09 |
24,60 |
| 2001 | 6,65 |
-6,21 |
| 2002 | 6,73 |
1,20 |
| 2003 | 7,65 |
13,67 |
| 2004 | 12,08 |
57,91 |
| 2005 | 13,33 |
10,35 |
| 2006 | 21,39 |
60,47 |
| 2007 | 21,30 |
-0,42 |
| 2008 | 19,54 |
-8,26 |
| 2009 | 14,75 |
-24,51 |
| 2010 | 18,06 |
22,44 |
| 2011 | 18,54 |
2,66 |
| 2012 | 16,33 |
-11,92 |
| 2013 | 15,08 |
-7,65 |
| 2014 | 14,68 |
-2,65 |
| 2015 | 12,20 |
-16,89 |
| 2016 | 10,28 |
-15,74 |
| 2017 | 11,48 |
11,67 |
|
