New York is the only U.S. city to make it into the top 10 of the overall index. The safety of cities can ebb and flow. New York recorded a record high of 2,245 homicides in 1990, equating to six murders a day. Since then the population has grown by over 1 million people, while homicide rates have fallen. The murder rate in 2013 stood at 335, a historic low. New York ranks third for digital security, with three of the four other U.S. cities in the Index (Los Angeles, San Francisco and Chicago) joining it in the top 10 on the digital security list.