Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank 2012 | Country | UNWTO Region | International tourism expenditure 2011 | International tourism expenditure 2012 | % change |
| --- | --- | --- | --- | --- | --- |
| 1.0 | China | Asia | $72.3 billion | $102.0 billion | 40.5 |
| 2.0 | Germany | Europe | $85.9 billion | $83.8 billion | 2.4 |
| 3.0 | United States | North America | $78.7 billion | $83.7 billion | 6.6 |
| 4.0 | United Kingdom | Europe | $51.0 billion | $52.3 billion | 2.5 |
| 5.0 | Russia | Europe | $32.5 billion | $42.8 billion | 31.6 |
| 6.0 | France | Europe | $44.1 billion | $38.1 billion | 13.6 |
| 7.0 | Canada | North America | $33.3 billion | $35.2 billion | 5.7 |
| 8.0 | Japan | Asia | $27.2 billion | $28.1 billion | 3.3 |
| 9.0 | Australia | Oceania | $26.7 billion | $27.6 billion | 3.4 |
Question:
How many countries spent at least $51.0 billion in international tourism in 2012?
Answer:
4.0