However, wholesale businesses have declined 2.8% while retail establishment have increased 8.1%. This has a positive effect on employment, but this activity adds less to the GDP. The largest sector of retail sales is in street markets called tianguis, followed by public markets, street peddlers and lastly through the Central de Abasto. A total of 32.5% is employed in industry, minerals and construction. Industry includes food processing, bottling, tobacco products, metals, machinery, surgical equipment, paper and printing and textiles. Only 0.3% is now employed in agriculture or livestock. The Passion Play of Iztapalapa has its origin in an outbreak of cholera in 1833, which left many dead and many children orphaned. A procession was performed to an image of Christ called the “Señor de la Cuevita” (Lord of the Little Cave) to end the epidemic. When it subsided, it was considered a miracle and various cults to this Christ figure appeared. Expressions of gratitude to this figure eventually consolidated into two annual events. The first is a Mass in honor of these images, now known as the Fiesta de Solteras de Septiembre. The second is the annual Passion Play. The Passion Play is considered to be part of “folk religion,” supported by clergy but not considered to be liturgy. The Passion Play has antecedents in the plays put on by evangelizers to teach the Catholic faith and to get the indigenous to renounce their former beliefs. However, the passion play incorporates areas which were special or sacred to the pre Hispanic world, including the gardens that once belonged to the emperor Cuitláhuac and the hill on which the New Fire ceremony was performed. The Passion Play started as a number of reenactment events held in a number of places in the borough during Lent and Holy Week, including a procession with the Señor de la Cuevita on the fifth Friday of Lent. However, by the early 20th century, one main passion play for the borough had come into existence. According to one local legend, Emiliano Zapata lent his horses for the 1914 version of the play. Since that time, this Passion Play has become a major event with the participation of 450 actors and attended by 2 million people over the course of the week and 2,000 police to provide security. This includes people from other parts of Mexico, from abroad and from the media. It is the most crowded and best known of its type in Mexico.