Carlos Mendoza has the PNC's numbers on homicides committed during the first six months of 2012. June saw a bit of an uptick, but 2012 is still on pace to have fewer homicides committed than 2011, which was less than 2010, which was less than 2009 in case you were wondering.
Femicide looks like it will decline as well. In 2009, 262 women were killed during the first six months of 2012, nearly 100 less than the 340 killed during the first six months of 2011.
Homicides are the only way to measure violence in Guatemala, but it is important to get the trend right.