Afghanistan has fallen three places in the annual corruption ranking from a year earlier despite receiving billions of dollars a year in international support.

Berlin-based anti-corruption body, Transparency International (TI), said in its report released Tuesday that Somalia, Afghanistan, Myanmar, Sudan and Iraq are the bottom five nations in the survey among 180 countries.

TI says the public sector corruption in Afghanistan has degenerated over the past two years and is now seen to be more uncontrolled than in any country with the exception of Somalia.

"Examples of corruption range from public posts for sale and justice for a price to daily bribing for basic services," the watchdog said about Afghanistan.

"This, along with the exploding opium trade, which is also linked to corruption, contributes to the downward trend in the country's score."

The survey scores countries on a scale from zero to ten, with zero indicating high levels of perceived corruption and ten showing low corruption levels.

For the third consecutive year, the east African nation of Somalia came in last, this time with a score of 1.1.

According to the survey, the cleanest countries with ranking close to a perfect 10 are New Zealand, Denmark and Singapore.

Meanwhile, TI also recommended that tax havens such as Switzerland and Liechtenstein do away with secrecy in banking laws.

"Corrupt money must not find a safe haven. It's time to put an end to secrecy in banking laws," the Berlin-based group's head, Huguette Labelle, said.

MVZ/MTM/AKM