| Années | Nombres d'actes |
|---|---|
| 1970 | 2 |
| 1971 | 4 |
| 1972 | 66 |
| 1973 | 55 |
| 1974 | 74 |
| 1975 | 93 |
| 1976 | 99 |
| 1977 | 104 |
| 1978 | 129 |
| 1979 | 135 |
| 1980 | 157 |
| 1981 | 153 |
| 1982 | 149 |
| 1983 | 159 |
| 1984 | 184 |
| 1985 | 141 |
| 1986 | 173 |
| 1987 | 125 |
| 1988 | 116 |
| 1989 | 189 |
| 1990 | 138 |
| 1991 | 157 |
| 1992 | 143 |
| 1993 | 107 |
| 1994 | 106 |
| 1995 | 78 |
| 1996 | 83 |
| 1997 | 59 |
| 1998 | 74 |
| 1999 | 44 |
| 2000 | 43 |
| 2001 | 26 |
| 2002 | 19 |
| 2003 | 13 |
| 2004 | 23 |
| 2005 | 27 |
| 2006 | 39 |
| 2007 | 37 |
| 2008 | 46 |
| 2009 | 46 |
| 2010 | 49 |
| 2011 | 29 |
| 2012 | 33 |
| 2013 | 34 |
| 2014 | 33 |
| 2015 | 52 |
| 2016 | 35 |
| 2017 | 22 |
| 2018 | 39 |
| 2019 | 20 |