Table:
text: List of corporations by market capitalization
2004
2004
Rank_ Name_ Headquarters Primary_industry Market_value_USD_million
1 General Electric United States Conglomerate 299336
2 Microsoft United States Software industry 271911
3 Exxon Mobil United States Oil and gas 263940
4 Pfizer United States Health care 261616
5 Citigroup United States Banking 259191
6 Wal-Mart United States Retail 258888
7 American International Group United States Insurance 183696
8 Intel Corporation United States Computer hardware 179996
9 BP United Kingdom Oil and gas 174648
10 HSBC United Kingdom Banking 163574

Question: How many ranks does a healthcare industry have in the 2004 list of companies by market capitalization?