| year | sum | total |
| 1975-1985 | 6 | 10 |
| 1986 | 7 | 13 |
| 1987 | 9 | 22 |
| 1988 | 17 | 39 |
| 1989 | 36 | 75 |
| 1990 | 33 | 108 |
| 1991 | 20 | 128 |
| 1992 | 51 | 179 |
| 1993 | 44 | 223 |
| 1994 | 52 | 275 |
| 1995 | 40 | 315 |
| 1996 | 53 | 368 |
| 1997 | 42 | 410 |
| 1998 | 65 | 475 |
| 1999 | 65 | 540 |
| 2000 | 57 | 597 |
| 2001 | 53 | 650 |
| 2002 | 53 | 703 |
| 2003 | 42 | 745 |
| 2004 | 44 | 789 |
| 2005 | 41 | 830 |
| 2006 | 31 | 861 |
| 2007 | 39 | 900 |
| 2008 | 46 | 946 |
| 2009 | 56 | 1002 |
| 2010 | 67 | 1069 |
| 2011 | 81 | 1150 |
| 2012 | 67 | 1217 |
including in press
