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 | Song Title | Artist | Sales | Highest Position |
| --- | --- | --- | --- | --- |
| 1 | Unchained Melody/White Cliffs of Dover | Robson Green & Jerome Flynn | 1,844,000 | 1 |
| 2 | Gangsta's Paradise | Coolio featuring L.V. | 1,110,000 | 1 |
| 3 | I Believe/Up on the Roof | Robson Green & Jerome Flynn | 1,049,000 | 1 |
| 4 | Back for Good | Take That | 960,000 | 1 |
| 5 | Think Twice | Céline Dion | 928,000 | 1 |
| 6 | Fairground | Simply Red | 782,000 | 1 |
| 7 | You Are Not Alone | Michael Jackson | 714,000 | 1 |
| 8 | Earth Song | Michael Jackson | 802,000 | 1 |
| 9 | Missing | Everything but the Girl | 696,000 | 3 |
| 10 | Wonderwall | Oasis | 665,000 | 2 |
| 11 | Boom Boom Boom | Outhere Brothers | 652,000 | 1 |
| 12 | Country House | Blur | 642,000 | 1 |
| 13 | Father and Son | Boyzone | 620,000 | 2 |
| 14 | Don't Stop (Wiggle Wiggle) | Outhere Brothers | 617,000 | 1 |
| 15 | Boombastic | Shaggy | 557,000 | 1 |
| 16 | Cotton Eye Joe | Rednex | 512,000 | 1 |
| 17 | Set You Free | N-Trance | 503,000 | 2 |
| 18 | Living Next Door to Alice | Smokie featuring Roy Chubby Brown | 495,000 | 3 |
| 19 | Hold Me, Thrill Me, Kiss Me, Kill Me | U2 | 471,000 | 2 |
| 20 | Roll with It | Oasis | 456,000 | 2 |
| 21 | Guaglione | Perez 'Prez' Prado & his Orchestra | 445,000 | 2 |
| 22 | I'll Be There for You | The Rembrandts | 421,000 | 3 |
| 23 | Two Can Play That Game | Bobby Brown | 413,000 | 3 |
| 24 | Here Comes The Hotstepper | Ini Kamoze | 407,000 | 4 |
| 25 | Shy Guy | Diana King | 405,000 | 2 |
| 26 | It's Oh So Quiet | Björk | 404,000 | 4 |
| 27 | Never Forget | Take That | 403,000 | 1 |
| 28 | Don't Give Me Your Life | Alex Party | 395,000 | 2 |
| 29 | Waterfalls | TLC | 355,000 | 4 |
| 30 | Scatman (Ski Ba Bop Ba Dop Bop) | Scatman John | 352,000 | 2 |
| 31 | Some Might Say | Oasis | 346,000 | 1 |
| 32 | You'll See | Madonna | 342,000 | 5 |
| 33 | Thunder | East 17 | 339,000 | 4 |
| 34 | Stayin' Alive | N-Trance featuring Ricardo Da Force | 335,000 | 2 |
| 35 | I'd Lie for You (And That's the Truth) | Meat Loaf | 334,000 | 2 |
| 36 | Common People | Pulp | 326,000 | 2 |
| 37 | Fantasy | Mariah Carey | 323,000 | 4 |
| 38 | I've Got a Little Something For You | MN8 | 317,000 | 2 |
| 39 | Kiss From A Rose/I'm Alive | Seal | 310,000 | 4 |
| 40 | Dreamer | Livin' Joy | 303,000 | 1 |
Question:
what is the difference between the sales of "think twice" and "back for good"?
Answer:
32000