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:
| Position | Album Title | Artist | Highest Position | Sales |
| --- | --- | --- | --- | --- |
| 1.0 | Scissor Sisters | Scissor Sisters | 1.0 | 1594259.0 |
| 2.0 | Hopes and Fears | Keane | 1.0 | 1593677.0 |
| 3.0 | Greatest Hits | Robbie Williams | 1.0 | 1530000.0 |
| 4.0 | Songs About Jane | Maroon 5 | 1.0 | 1495000.0 |
| 5.0 | Call Off The Search | Katie Melua | 1.0 | 1350000.0 |
| 6.0 | Anastacia | Anastacia | 1.0 | 1110000.0 |
| 7.0 | Confessions | Usher | 1.0 | 1095000.0 |
| 8.0 | Encore | Eminem | 1.0 | 1077000.0 |
| 9.0 | Feels Like Home | Norah Jones | 1.0 | 1000000.0 |
| 10.0 | Final Straw | Snow Patrol | 3.0 | 980000.0 |
| 11.0 | Il Divo | Il Divo | 1.0 | 960000.0 |
| 12.0 | Greatest Hits | Guns N' Roses | 1.0 | 920000.0 |
| 13.0 | 10 Years of Hits | Ronan Keating | 1.0 | 870000.0 |
| 14.0 | A Grand Don't Come for Free | The Streets | 1.0 | 869000.0 |
| 15.0 | How To Dismantle An Atomic Bomb | U2 | 1.0 | 855000.0 |
| 16.0 | The Soul Sessions | Joss Stone | 4.0 | 775000.0 |
| 17.0 | Franz Ferdinand | Franz Ferdinand | 3.0 | 770000.0 |
| 18.0 | American Idiot | Green Day | 1.0 | 746364.0 |
| 19.0 | Unwritten | Natasha Bedingfield | 1.0 | 680000.0 |
| 20.0 | Patience | George Michael | 1.0 | 660000.0 |
| 21.0 | Friday's Child | Will Young | 1.0 | 640000.0 |
| 22.0 | Ultimate Kylie | Kylie Minogue | 4.0 | 595000.0 |
| 23.0 | Speakerboxxx / The Love Below | Outkast | 8.0 | 590000.0 |
| 24.0 | Allow Us To Be Frank | Westlife | 3.0 | 585000.0 |
| 25.0 | Greatest Hits: My Prerogative | Britney Spears | 2.0 | 585000.0 |
| 26.0 | Elephunk | The Black Eyed Peas | 3.0 | 580000.0 |
| 27.0 | Twentysomething | Jamie Cullum | 3.0 | 565000.0 |
| 28.0 | Greatest Hits | Shania Twain | 6.0 | 545000.0 |
| 29.0 | Room on the Third Floor | McFly | 1.0 | 540000.0 |
| 30.0 | Life For Rent | Dido | 1.0 | 520000.0 |
| 31.0 | Under My Skin | Avril Lavigne | 1.0 | 510000.0 |
| 32.0 | O | Damien Rice | 8.0 | 495000.0 |
| 33.0 | Mind Body & Soul | Joss Stone | 1.0 | 490000.0 |
| 34.0 | The College Dropout | Kanye West | 12.0 | 455000.0 |
| 35.0 | Thank You | Jamelia | 4.0 | 425000.0 |
| 36.0 | Destiny Fulfilled | Destiny's Child | 5.0 | 420000.0 |
| 37.0 | Best of | Blue | 6.0 | 415000.0 |
| 38.0 | The Best of | LeAnn Rimes | 2.0 | 410000.0 |
| 39.0 | Love Songs: A Compilation... Old and New | Phil Collins | 10.0 | 408000.0 |
| 40.0 | The Singles 1992-2003 | No Doubt | 5.0 | 406000.0 |
Question:
What is the average high position for the album unwritten?
Answer:
1.0