Table:
text: List of rampage killers
Europe
Europe
Perpetrator Date_ Year_ Location_ Country Killed Injured
Grachev, Peter 07.31 July 31 1925 Ivankovo Soviet Union 17 03 3
Ryan, Michael Robert , 27 08.19 Aug. 19 1987 Hungerford United Kingdom 16 15
Borel, Eric , 16 09.23 Sep. 23/24 1995 Solliès-Pont & Cuers France 15 04 4
Leibacher, Friedrich , 57 09.27 Sep. 27 2001 Zug Switzerland 14 18
Wagner, Ernst August , 38 09.04 Sep. 4 1913 Degerloch & Mühlhausen/Enz German Empire 14 11
Hz 06.32 1939.9 Kz Fz 100.9 100.9
Unknown 06.10 June 10/11 1945 Rouen France 14 09 9
Dornier, Christian , 31 07.12 July 12 1989 Luxiol France 14 08 8

Question: How many kills have 15 like the injured with a year before 1987 on the list of Europe's gunman?