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:
| State (class) | Vacator | Reason for change | Successor | Date of successors formal installation |
| --- | --- | --- | --- | --- |
| Tennessee (1) | Vacant | Tennessee failed to elect a Senator on time | William Cocke ( DR ) | Appointed May 15, 1797 |
| Tennessee (2) | William Blount ( DR ) | Expelled July 8, 1797 | Joseph Anderson ( DR ) | Elected September 26, 1797 |
| Tennessee (1) | William Cocke ( DR ) | Interim appointment until September 26, 1797 | Andrew Jackson ( DR ) | Elected September 26, 1797 |
| Rhode Island (2) | William Bradford ( F ) | Resigned sometime in October, 1797 | Ray Greene ( F ) | Elected November 13, 1797 |
| Vermont (1) | Isaac Tichenor ( F ) | Resigned October 17, 1797 | Nathaniel Chipman ( F ) | Elected October 17, 1797 |
| Maryland (3) | John Henry ( F ) | Resigned December 10, 1797 | James Lloyd ( F ) | Elected December 11, 1797 |
| New York (1) | Philip John Schuyler ( F ) | Resigned January 3, 1798 | John Sloss Hobart ( F ) | Elected January 11, 1798 |
| Delaware (2) | John Vining ( F ) | Resigned January 19, 1798 | Joshua Clayton ( F ) | Elected January 19, 1798 |
| Tennessee (1) | Andrew Jackson ( DR ) | Resigned sometime in April, 1798 | Daniel Smith ( DR ) | Appointed October 6, 1798 |
| New York (1) | John Sloss Hobart ( F ) | Resigned April 16, 1798 | William North ( F ) | Appointed May 5, 1798 |
| Delaware (2) | Joshua Clayton ( F ) | Died August 11, 1798 | William H. Wells ( F ) | Elected January 17, 1799 |
| New York (1) | William North ( F ) | Interim appointment until August 17, 1798 | James Watson ( F ) | Elected August 17, 1798 |
| New Jersey (1) | John Rutherfurd ( F ) | Resigned November 26, 1798 | Franklin Davenport ( F ) | Appointed December 5, 1798 |
| South Carolina (2) | John Hunter ( DR ) | Resigned November 26, 1798 | Charles Pinckney ( DR ) | Elected December 6, 1798 |
Question:
What is the number of vacators when the successor was William H. Wells ( F )?
Answer:
1.0