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:
| Game | Date | Team | Score | High points | High rebounds | High assists | Location Attendance | Record |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 18.0 | December 1 | Minnesota | W 100–86 (OT) | Shawn Marion (16) | Tyson Chandler (18) | Jason Terry (7) | American Airlines Center 19,567 | 14–4 |
| 19.0 | December 3 | @ Utah | W 93–81 (OT) | Dirk Nowitzki (26) | Tyson Chandler (8) | Jason Terry (7) | EnergySolutions Arena 19,623 | 15–4 |
| 20.0 | December 4 | @ Sacramento | W 105–103 (OT) | Dirk Nowitzki (25) | Shawn Marion (8) | José Juan Barea (6) | ARCO Arena 12,900 | 16–4 |
| 21.0 | December 7 | Golden State | W 105–100 (OT) | Dirk Nowitzki (25) | Ian Mahinmi (10) | Jason Kidd (7) | American Airlines Center 19,593 | 17–4 |
| 22.0 | December 9 | New Jersey | W 102–89 (OT) | Dirk Nowitzki (12) | Dirk Nowitzki (10) | José Juan Barea (13) | American Airlines Center 19,666 | 18–4 |
| 23.0 | December 11 | Utah | W 103–97 (OT) | Dirk Nowitzki (31) | Dirk Nowitzki (15) | Jason Kidd (9) | American Airlines Center 20,074 | 19–4 |
| 24.0 | December 13 | Milwaukee | L 99–103 (OT) | Dirk Nowitzki (30) | Tyson Chandler (9) | Jason Kidd (10) | American Airlines Center 19,720 | 19–5 |
| 25.0 | December 15 | Portland | W 103–98 (OT) | Caron Butler (23) | Tyson Chandler (8) | Jason Kidd (6) | American Airlines Center 19,531 | 20–5 |
| 26.0 | December 17 | Phoenix | W 106–91 (OT) | Dirk Nowitzki , Jason Terry (18) | Tyson Chandler (12) | Jason Kidd (8) | American Airlines Center 20,406 | 21–5 |
| 27.0 | December 20 | @ Miami | W 98–96 (OT) | Dirk Nowitzki (26) | Shawn Marion (13) | Jason Kidd (7) | American Airlines Arena 20,178 | 22–5 |
| 28.0 | December 21 | @ Orlando | W 105–99 (OT) | Caron Butler (20) | Dirk Nowitzki (8) | Jason Kidd (12) | Amway Center 19,057 | 23–5 |
| 29.0 | December 27 | @ Oklahoma City | W 103–93 (OT) | Caron Butler (21) | Tyson Chandler (10) | Jason Kidd (10) | Oklahoma City Arena 18,203 | 24–5 |
| 30.0 | December 28 | Toronto | L 76–84 (OT) | Jason Terry (18) | Tyson Chandler , Jason Kidd (6) | Jason Terry (6) | American Airlines Center 20,027 | 24–6 |
Question:
Who had highest assists at game on December 21?
Answer:
1.0