Traditionally agricultural, Liechtenstein has been increasingly industrialized, with industry now employing over half of the workforce. Most of the rest of the labor force works in the service sector. Only a small fraction of the population still engages in agriculture (dairying and the raising of livestock and cereals). The leading manufactured products are machinery and other metal goods, pharmaceuticals, optical lenses, electronic equipment, textiles, ceramics, and consumer goods. A large part of the production is exported. Tourism is an increasingly important industry. Much revenue is derived from the minimal taxes imposed on international corporations, which, because of the low taxes, are headquartered there. The stable political environment and the secrecy of its financial institutions contribute to its reputation as a banking center. Liechtenstein is a member of the European Free Trade Association (EFTA). The ruling prince is Hans-Adam II. A constitution has been in effect since 1921. Members of the 25-seat unicameral parliament are elected by popular vote for four-year terms. Liechtenstein uses Swiss currency and is represented abroad through Switzerland. The country has no army and only a small police force. Liechtenstein is divided into 11 communes.