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:
| Date | Cover model | Centerfold model | Interview subject | 20 Questions | Pictorials |
| --- | --- | --- | --- | --- | --- |
| 1-05 | Jenny McCarthy | Destiny Davis | Toby Keith | James Caan | Jenny McCarthy |
| 2-05 | Teri Polo | Amber Campisi | Nicole Kidman | Jolene Blalock | Teri Polo, Girls of Fear Factor |
| 3-05 | Paris Hilton | Jillian Grace | The Rock | Kid Rock | Deborah Gibson |
| 4-05 | Christy Hemme | Courtney Rachel Culkin | Les Moonves | Mena Suvari | Christy Hemme, Girls of Brazil |
| 6-05 | Bai Ling | Kara Monaco | Lance Armstrong | Paul Giamatti | Playmate of the Year Tiffany Fallon , Bai Ling |
| 7-05 | Joanna Krupa | Qiana Chase | Owen Wilson | Scarlett Johansson | Joanna Krupa, Karina Lombard |
| 8-05 | Diora Baird | Tamara Witmer | Ewan McGregor | Kate Hudson | Diora Baird, Cirque du Soleil 's Zumanity |
| 9-05 | Jessica Canseco | Vanessa Hoelsher | Thomas L. Friedman | Kurt Busch | Jessica Canseco, Blondes of Sweden |
Question:
How many times was Jillian Grace the centerfold model?
Answer:
1.0