표 2에서 보는 것처럼 수입이 최고수준에 있었던 2007년에는 2조 7,671억 원이 걷혀 국세수입의 1.808%를 차지했다.
As shown in Table 2, in 2007, when income was at the highest level, KRW 2.76 trillion was raised, accounting for 2% of national tax revenue.