In recent years, Beijing's tourism has developed steadily. The following is the total number of tourists in Beijing from 2009 to 20 12 according to the data provided by Beijing Tourism Network.

① As can be seen from the figure 1, from 2009 to 20 12, the largest number of tourists in Beijing was 20 12.

An increase of180,000 person-times over the previous year; Mistakes;

② On 20/200912, the highest total tourism revenue in Beijing was 2012; Mistakes;

③ In 2009, Beijing's total tourism revenue was 2442 1 100 million yuan, a year-on-year increase of 10.0%.

∴ 2442.1∴ (1+10%) ≈ 2220 (one hundred million yuan),

In 2008, Beijing's total tourism revenue was 222 billion yuan. Correct.

So the answer is: ③.