Answer a question about this article:
Like many American cities, Philadelphia saw a gradual yet pronounced rise in crime in the years following World War II. There were 525 murders in 1990, a rate of 31.5 per 100,000. There were an average of about 600 murders a year for most of the 1990s. The murder count dropped in 2002 to 288, then rose four years later to 406 in 2006 and 392 in 2007. A few years later, Philadelphia began to see a rapid drop in homicides and violent crime. In 2013, there were 246 murders, which is a decrease of over 25% from the previous year, and a decrease of over 44% since 2007. And in 2014, there were 248 homicides, up by one since 2013.
How many murders occurred in 1990?
525