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 | Name | Headquarters | Primary industry | Market value ( USD million) |
| --- | --- | --- | --- | --- |
| 1.0 | General Electric | United States | Conglomerate | 299336.0 |
| 2.0 | Microsoft | United States | Software industry | 271911.0 |
| 3.0 | Exxon Mobil | United States | Oil and gas | 263940.0 |
| 4.0 | Pfizer | United States | Health care | 261616.0 |
| 5.0 | Citigroup | United States | Banking | 259191.0 |
| 6.0 | Wal-Mart | United States | Retail | 258888.0 |
| 7.0 | American International Group | United States | Insurance | 183696.0 |
| 8.0 | Intel Corporation | United States | Computer hardware | 179996.0 |
| 9.0 | BP | United Kingdom | Oil and gas | 174648.0 |
| 10.0 | HSBC | United Kingdom | Banking | 163574.0 |
Question:
How many ranks have an industry of health care?
Answer:
1.0