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:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | Production code |
| --- | --- | --- | --- | --- | --- | --- |
| 98.0 | 1.0 | "Episode I: The Baby Menace" (Part 3) | Terry Hughes | David M. Israel & Jim O'Doherty | September21,1999 | 501.0 |
| 99.0 | 2.0 | "Dick for Tat" | Terry Hughes | Bill Martin & Mike Schiff | September28,1999 | 502.0 |
| 100.0 | 3.0 | "The Fifth Solomon" | Terry Hughes | Gregg Mettler | November2,1999 | 505.0 |
| 101.0 | 4.0 | "Dial M for Dick" | Terry Hughes | Christine Zander | November9,1999 | 504.0 |
| 102.0 | 5.0 | "Dick and Tuck" | Terry Hughes | Bob Kushell | November16,1999 | 503.0 |
| 103.0 | 6.0 | "Dick, Who's Coming to Dinner" | Terry Hughes | Jason Venokur & David Goetsch | November23,1999 | 507.0 |
| 104.0 | 7.0 | "Sex and the Sally" | Terry Hughes | Julie E. Sherman | November30,1999 | 509.0 |
| 105.0 | 8.0 | "Charitable Dick" | Terry Hughes | David Sacks | December14,1999 | 508.0 |
| 106.0 | 9.0 | " The Loud Solomon Family: A Dickumentary " | Terry Hughes | Valerie Watson | January11,2000 | 506.0 |
| 107.0 | 10.0 | "Gwen, Larry, Dick & Mary" | Terry Hughes | Christine Zander | January25,2000 | 512.0 |
| 108.0 | 11.0 | "Dick Puts the ID in Cupid" | Terry Hughes | David Goetsch & Jason Venokur | February8,2000 | 514.0 |
| 109.0 | 12.0 | "The Big Giant Head Returns" | Terry Hughes | David Sacks | February22,2000 | 517.0 |
| 110.0 | 13.0 | "Rutherford Beauty" | Terry Hughes | Bob Kushell & Gregg Mettler | February22,2000 | 511.0 |
| 111.0 | 14.0 | "This Little Dick Went to Market" | Terry Hughes | Dave Boerger | March14,2000 | 518.0 |
| 112.0 | 15.0 | "Youth Is Wasted on the Dick" | Terry Hughes | Nastaran Dibai & Jeffrey B. Hodes | March21,2000 | 515.0 |
| 113.0 | 16.0 | "Dick Strikes Out" | Terry Hughes | Aron Abrams & Gregory Thompson | March28,2000 | 510.0 |
| 114.0 | 17.0 | "Shall We Dick?" | Terry Hughes | Bill Martin & Mike Schiff | April18,2000 | 513.0 |
| 115.0 | 18.0 | "Dick and Harry Fall in a Hole" | Terry Hughes | Gregory Thompson & Aron Abrams | May2,2000 | 519.0 |
| 116.0 | 19.0 | "Frankie Goes to Rutherford" | Terry Hughes | Gregg Mettler & Will Forte | May9,2000 | 520.0 |
| 117.0 | 20.0 | "Dick Solomon's Day Off" | Terry Hughes | Jim O'Doherty & David M. Israel | May16,2000 | 516.0 |
| 118.0 | 21.0 | "The Big Giant Head Returns Again (Part 1)" | Terry Hughes | David Goetsch & Jason Venokur | May23,2000 | 521.0 |
Question:
How many episodes were written by Gregg Mettler?
Answer:
1.0