Last Friday, Islamic State terrorists carried out a series of coordinated attacks in Paris that killed at least 130 people, causing a global outpouring of outrage and sympathy. The strikes highlighted a disturbing and dramatic increase in the number of large-scale terrorist attacks — and raised uncomfortable questions about why some deaths receive so little attention from Western media.

report released on Monday from the National Consortium for the Study of Terrorism and Responses to Terrorism, a research center based at the University of Maryland, said the number of strikes killing more than 100 civilians averaged about 4.2 per year between 1978 and 2013. In 2014, that figure skyrocketed more than 500 percent, to 26. In the first half of 2015, START counted 11 more. The majority of the attacks have taken place in Africa and the Middle East.
Below, a list of 10 of the deadliest terrorist attacks of 2015 from around the world:

Date: Jan. 3
Death Toll: Reports range from 2,000 to 150.
Perpetrator: Boko Haram
Location: Baga, Nigeria

Date: March 20
Death Toll: 137
Perpetrator: Islamic State
Location: Yemen

Date: April 2
Death Toll: At least 147
Perpetrator: Al-Shabab
Location: Kenya

Date: April 29 – 30
Death Toll: At least 91
Perpetrator: Boko Haram
Location: Cameroon

Date: June 25
Death Toll: At least 154
Perpetrator: Islamic State
Location: Syria

Date: June 30 – July 1
Death Toll: 150
Perpetrator: Boko Haram
Location: Nigeria

Date: July 17
Death Toll: 120
Perpetrator: Islamic State
Location: Iraq

Date: Aug. 13
Death Toll: At least 76
Perpetrator: Islamic State
Location: Iraq

Date: Sept. 20
Death Toll: At least 80
Perpetrator: Likely Boko Haram
Location: Nigeria

Date: Oct. 31
Death Toll: 224
Perpetrator: Islamic State
Location: Egypt
Photo credit: AHMAD AL-RUBAYE/AFP/Getty Images