Huevos said:
How may is it that have failed now?
List of previous failures since 1990:
8/9/1990 Proton-K/DM-2 345-02 TB 200/39 Ekran-M 3rd stg 349sec (foreign object ox feed) FTO
5/27/1993 Proton-K/DM-2 364-02 TB 81/23 Gorizont 2nd & 3rd stg engine fail (contaminants) FTO
2/19/1996 Proton-K/DM-2 383-02 TB 200/39 Raduga Blok DM-2 2nd burn fail (unknown) (EEO)
11/16/1996 Proton-K/D-2 392-02 TB 200/39 Mars-96 Blok D-2 2nd burn fail (S/C control sys) (LEO)
12/24/1997 Proton-K/DM-2M 394-01 TB 81/23 Asiasat 3 Blok DM-2M fail (turbopump seal coating) (GTO)
7/5/1999 Proton-K/Briz-M 389-01 TB 81/24 Raduga 2nd stg eng 277sec (turbopump, particles) FTO
10/27/1999 Proton-K/DM-2 386-02 TB 200/39 Ekspress A No. 1 2nd stg eng 222sec (turbopump, particles) FTO
11/25/2002 Proton-K/DM-2M 408-02 TB 81/23 Astra 1K Blok DM-2M 2nd burn (blked gas gen valve) (LEO)
02/28/2006 Proton M/Briz M 535-11 TB 200/39 Arabsat 4A Briz M 2nd of 4 burns (foreign paticles) (EEO)
09/05/2007 Proton M/Briz M 535-22 TB 200/39 JCSAT 11 (4t) Cable fault, pyro fail during 1/2 staging FTO
03/14/2008 Proton M/Briz M 535-25 TB 200/39 AMC 14 (4.14t) Briz M fail during 2nd of 3 planned burns (LEO)
12/05/2010 Proton M/DM-03 535-37 TB 81/24 3xGlonass M Prop overload of 1st DM-03. 100m/s <LEO FTO
08/17/2011 Proton M/Briz M 935-21 TB 200/39 Express AM4 Lost>4 of 5 Briz M burns. Guidance program [EEO]
08/06/2012 Proton M/Briz M P379 TB 81/24 Telkom 3/ExpressMD2 3rd of 4 planned Briz M burns failed, leak.[EEO]
12/08/2012 Proton M/Briz M P383 TB 200/39 Yamal 402 Turbopump fail during 4th of 4 Briz M burns[EEO]</pre>
<p>Taken from
http://www.spacelaunchreport.com/profail.txt (see full list here).