|
| Années | Valeurs | Variations (%) ** |
| 1970 | 6,63 |
|
| 1971 | 5,90 |
-11,01 |
| 1972 | 5,56 |
-5,76 |
| 1973 | 6,83 |
22,84 |
| 1974 | 27,65 |
304,83 |
| 1975 | 16,90 |
-38,88 |
| 1976 | 19,43 |
14,97 |
| 1977 | 20,79 |
7,00 |
| 1978 | 22,32 |
7,36 |
| 1979 | 40,88 |
83,15 |
| 1980 | 33,03 |
-19,20 |
| 1981 | 17,60 |
-46,72 |
| 1982 | 9,63 |
-45,28 |
| 1983 | 18,07 |
87,64 |
| 1984 | 27,00 |
49,42 |
| 1985 | 26,66 |
-1,26 |
| 1986 | 13,56 |
-49,14 |
| 1987 | 23,34 |
72,12 |
| 1988 | 22,93 |
-1,76 |
| 1989 | 36,86 |
60,75 |
| 1990 | 42,55 |
15,44 |
| 1991 | 24,05 |
-43,48 |
| 1992 | 27,05 |
12,47 |
| 1993 | 41,58 |
53,72 |
| 1994 | 36,19 |
-12,96 |
| 1995 | 36,95 |
2,10 |
| 1996 | 41,11 |
11,26 |
| 1997 | 45,44 |
10,53 |
| 1998 | 24,14 |
-46,87 |
| 1999 | 38,52 |
59,57 |
| 2000 | 56,95 |
47,85 |
| 2001 | 42,20 |
-25,90 |
| 2002 | 39,73 |
-5,85 |
| 2003 | 34,76 |
-12,51 |
| 2004 | 42,75 |
22,99 |
| 2005 | 55,14 |
28,98 |
| 2006 | 59,62 |
8,12 |
| 2007 | 51,31 |
-13,94 |
| 2008 | 55,49 |
8,15 |
| 2009 | 37,72 |
-32,02 |
| 2010 | 50,54 |
33,99 |
| 2011 | 59,27 |
17,27 |
| 2012 | 56,69 |
-4,35 |
| 2013 | 45,36 |
-19,99 |
| 2014 | 40,06 |
-11,68 |
| 2015 | 25,03 |
-37,52 |
| 2016 | 20,87 |
-16,62 |
| 2017 | 42,67 |
104,46 |
|
