BERLIN: More than half of respondents in a global corruption survey released Tuesday think that graft has worsened over the past two years, and a quarter reported having paid officials a bribe in the last 12 months. The survey by Berlin-based non-profit group Transparency International also found that people have least trust in institutions meant to help or protect them, including police, the courts and political parties. Respondents also believed official anti-corruption efforts had deteriorated since the 2008 start of the world financial and economic crisis. The group’s Global Corruption Barometer 2013 is the world’s largest public opinion survey on corruption. It surveyed 114,000 people in 107 countries, the group said.