The other principal crops are wheat, barley, maize, grapes and olive oil.
Industrial production is concerned with cement, synthetic rubber, leather, textiles and ceramics.
Light industries have been expanding quickly in recent years as the Government seeks to diversify the economy away from tourism. Nonetheless, tourism provides most of the Republic's income, with approximately 3 million visitors each year. Stone-quarrying is an important export industry. Statistical details of San Marino's external trade are included with those of Italy, with whom San Marino maintains a customs union. However, there are differences in taxation and regulatory structures which have afforded San Marino the status of a minor tax haven as a growing number of non-resident deposits have been made in the principality's banks.