Protesters pack the Puerta del Sol plaza in central Madrid, Saturday May 12, 2012. The protesters returned to Sol to mark the anniversary of the protest movement that inspired groups in other countries. The protests began May 15 last year and drew hundreds and thousands of people calling themselves the indignant movement. The demonstrations spread across Spain and Europe as anti-austerity sentiment grew. (AP Photo/Paul White)
Protesters pack the Puerta del Sol plaza in central Madrid, Saturday May 12, 2012. The protesters returned to Sol to mark the anniversary of the protest movement that inspired groups in other countries. The protests began May 15 last year and drew hundreds and thousands of people calling themselves the indignant movement. The demonstrations spread across Spain and Europe as anti-austerity sentiment grew. (AP Photo/Paul White)
Spaniards kept up protests against politicians' handling of the economic crisis as growing numbers gathered in Madrid's Puerta del Sol on Tuesday, May 15.