The area around Kampot and Kep including the Bokor Hill Station are also of interest to visitors. Tourism has increased steadily each year in the relatively stable period since the 1993 UNTAC elections. Most international arrivals in 2018 were Chinese. Tourism receipts exceeded US$4.4 billion in 2018, accounting for almost ten percent of the kingdom's gross national product. The Angkor Wat historical park in Siem Reap Province, the beaches in Sihanoukville, the capital city Phnom Penh, and Cambodia's 150 casinos (up from just 57 in 2014) are the main attractions for foreign tourists. Cambodia's reputation as a safe destination for tourism however has been hindered by civil and political unrest and several high-profile examples of serious crime committed against tourists visiting the kingdom. Cambodia's tourist souvenir industry employs a lot of people around the main places of interest. The quantity of souvenirs that are produced is not sufficient to face the increasing number of tourists and a majority of products sold to the tourists on the markets are imported from China, Thailand, and Vietnam. Some of the locally produced souvenirs include: Krama (traditional scarf) Ceramics Soap, candles, spices Wood carvings, lacquerware, silver plate Painted bottles containing infused rice wine Agriculture Agriculture is the mainstay of the Cambodian economy. Agriculture accounted for 90 percent of GDP in 1985 and employed approximately 80 percent of the workforce. Rice is the principal commodity. Major secondary crops include maize, cassava, sweet potatoes, groundnuts, soybeans, sesame seeds, dry beans, and rubber. The principal commercial crop is rubber. In the 1980s it was an important primary commodity, second only to rice, and one of the country's few sources of foreign exchange. Transport The civil war and neglect severely damaged Cambodia's transport system. With assistance from other countries, Cambodia has been upgrading the main highways to international standards and most are vastly improved from 2006. Most main roads are now paved. Cambodia has two rail lines, totalling about of single, gauge track. The lines run from the capital to Sihanoukville on the southern coast. Trains are again running to and from the Cambodian capital and popular destinations in the south. After 14 years, regular rail services between the two cities restarted recently – offering a safer option than road for travellers. Trains also run from Phnom Penh to Sisophon (although trains often run only as far as Battambang). As of 1987, only one passenger train per week