The Government (2001-2006), led by an alliance of four parties (Bangladesh Nationalist Party, Bangladesh Jamaat-e-Islami, Islami Oikya Jote and Bangladesh Jatiyo Party) banned the Ahmadiyya literature by an executive order. Family laws concerning marriage, divorce, and adoption differ depending on the religion of the person involved. There are no legal restrictions on marriage between members of different faiths. In 2010, secularism was restored, but Islam remains the nominal state religion per Article 12. There have been several instances of violence against the religious minorities in Bangladesh. Hindus, Buddhists and Christians have come under widespread attacks by Islamist extremists during communal riots, elections and post-poll violence. Most of these attacks target Hindus, the largest minority of the country, who are particularly vulnerable in a period of rising violence and extremism, whether motivated by religious, political or criminal factors, or some combination. Bangladesh has been rocked by several anti-Hindu riots in 1992, 2001, 2013 and 2014. These violences included attacking and killing Hindus, looting and burning of Hindu-owned properties and businesses, abduction and rape of women, desecrating and destroying Hindu temples by the extremist Muslim mobs. There are also alleged discrimination against Hindus by the administration in the form of Vested Property Act by which over 40% of Hindu-owned lands and houses have been confiscated, intimidation during elections and revoking their names from electoral rolls. Since the rising of Islamist political parties during 1990s, large number of Hindu families have migrated from Bangladesh to India due to a sense of insecurity and economic necessity. These factors combined with lower birth rates of minorities have resulted in a dwindling Hindu population in the country. The Bihari ethnic minority in Bangladesh has been subject to persecution during and after 1971 Liberation War. Due to their pro-Pakistan stance, many Biharis were forcefully repatriated to Pakistan and those who stayed back were not granted citizenship and voting rights by Bangladesh government. Atheism is not common in Bangladesh. According to a 2014 WIN/GIA survey, 5% of respondents from Bangladesh identify as irreligious. There have been multiple attacks and murders of atheist bloggers, academics and authors by Islamist militants since 2013, with the government accused of being unable or unwilling to provide protection – and in some cases even persecuting atheists and imprisoning them.