The government collected 6.6 trillion won ($5.82 billion) in taxes last year by bringing the underground economy into the official economy, finance ministry data showed Wednesday.
Records for 2013-2016 submitted to the National Assembly for parliamentary audits showed the government had gained a yearly average of 5.39 trillion won in additional taxes in comparison to 2012 through such a process.
The sum in 2013 totaled 3.19 trillion won, which grew to 5.62 trillion won in 2014, 6.14 trillion won in 2015 and 6.6 trillion won last year. The figures exceed the goal set by the former Park Geun-hye administration every year.