I want to make worldwide annual summary on military conflicts intensity.
Have you looked at The Correlates of War project? Haven't used the dataset myself but I understand it's a project by a group of politician scientists collecting data on occurrences of war in recent history.
From the site description:
Version 4 of the Militarized Interstate Dispute (MID) data collection compiled by the Correlates of War Project provides information about conflicts in which one or more states threaten, display, or use force against one or more other states between 1816 and 2010. By definition, “Militarized interstate disputes are united historical cases of conflict in which the threat, display or use of military force short of war by one member state is explicitly directed towards the government, official representatives, official forces, property, or territory of another state. Disputes are composed of incidents that range in intensity from threats to use force to actual combat short of war” (Jones et al. 1996: 163).