From the San Francisco Chronicle:
Despite its rising prosperity, China has seen a dramatic increase in public demonstrations after several years of nervous quiet followed the violent government crackdown on the Tiananmen Square demonstrations in 1989. The number of protests grew to more than 58,000 in 2003, when an estimated 3 million Chinese took to the streets to air their grievances, said Scot Tanner, senior China analyst with Rand, citing police statistics.
See also Tanner’s recent testimony in front of the US-China Economic and Security Review Commission on “Chinese Government Responses to Rising Social Unrest”