Seattle in this period attracted widespread attention as home to these many companies, but also by hosting the 1990 Goodwill Games and the APEC leaders conference in 1993, as well as through the worldwide popularity of grunge, a sound that had developed in Seattle's independent music scene. Another bid for worldwide attention—hosting the World Trade Organization Ministerial Conference of 1999—garnered visibility, but not in the way its sponsors desired, as related protest activity and police reactions to those protests overshadowed the conference itself. The city was further shaken by the Mardi Gras Riots in 2001, and then literally shaken the following day by the Nisqually earthquake.
Yet another boom began as the city emerged from the Great Recession. Amazon.com moved its headquarters from North Beacon Hill to South Lake Union and began a rapid expansion. For the five years beginning in 2010, Seattle gained an average of 14,511 residents per year, with the growth strongly skewed toward the center of the city, as unemployment dropped from roughly 9 percent to 3.6 percent. The city has found itself "bursting at the seams", with over 45,000 households spending more than half their income on housing and at least 2,800 people homeless, and with the country's sixth-worst rush hour traffic.