| Années | Nombres d'actes |
|---|---|
| 1970 | 1 |
| 1971 | 8 |
| 1972 | 12 |
| 1973 | 9 |
| 1974 | 15 |
| 1975 | 12 |
| 1976 | 15 |
| 1977 | 16 |
| 1978 | 7 |
| 1979 | 12 |
| 1980 | 9 |
| 1981 | 9 |
| 1982 | 9 |
| 1983 | 13 |
| 1984 | 3 |
| 1985 | 10 |
| 1986 | 12 |
| 1987 | 8 |
| 1988 | 13 |
| 1989 | 3 |
| 1990 | 9 |
| 1991 | 16 |
| 1992 | 13 |
| 1993 | 11 |
| 1994 | 10 |
| 1995 | 19 |
| 1996 | 13 |
| 1997 | 15 |
| 1998 | 8 |
| 1999 | 17 |
| 2000 | 21 |
| 2001 | 15 |
| 2002 | 20 |
| 2003 | 18 |
| 2004 | 22 |
| 2005 | 10 |
| 2006 | 15 |
| 2007 | 13 |
| 2008 | 20 |
| 2009 | 16 |