Some inland cities have started providing migrants with social security, including pensions and other insurance. In 2012, there were a reported 167 million migrant workers in China, with trends of working closer to home within their own or a neighbouring province but with a wage drop of 21%. Because so many migrant workers are moving to the city from rural areas, employers can hire them to work in poor working conditions for low wages. Migrant workers in China are notoriously marginalized, especially due to the hukou system of residency permits, which tie one stated residence to all social welfare benefits. There has been a substantial flow of people from Bangladesh and Nepal to India over recent decades in search of better work. Researchers at the Overseas Development Institute found that these migrant workers are often subject to harassment, violence, and discrimination during their journeys at their destinations and when they return home. Bangladeshi women appear to be particularly vulnerable. These findings highlight the need to promote migrants' rights with, among others, health staff, police and employers at destination. The population of Indonesia, as the world's fourth largest, has contributed to the surplus of work forces. Combined with a scarcity of jobs at home, this has led numbers of Indonesians to seek work abroad. It is estimated that around 4.5 million Indonesians work abroad; 70% of them are women: most are employed in the domestic sector as maids and in the manufacturing sector. Most of them are between 18 and 35 years old. Around 30% are men, mostly working in plantations, construction, transportation and the service sector. Currently Malaysia employs the largest numbers of Indonesian migrant workers, followed by Taiwan, Saudi Arabia, Hong Kong, and Singapore. These are official numbers, the actual numbers might be far larger, due to unrecorded illegal entry of Indonesian workers into foreign countries. They are prone to exploitation, extortion, physical and sexual abuses, suffered by those enduring human trafficking. Several cases of abuses upon Indonesian migrant workers have been reported, and some have gained worldwide attention. During the Seventh Malaysia Plan (1995–2000), Malaysia's total population increased by 2.3% per year, while foreign residents (non-citizens) make up 7.6% of the total working-age population in Malaysia, not including illegal foreign residents. In 2008 the majority of migrant workers (1,085,658: 52.6%) originally came from Indonesia. This was followed by Bangladesh (316,401), Philippines (26,713), Thailand (21,065) and Pakistan (21,278).