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:
| Year | Theme | Artist | Mintage (Proof) | Issue Price (Proof) | Mintage (BU)[ clarification needed ] | Issue Price (BU)[ clarification needed ] |
| --- | --- | --- | --- | --- | --- | --- |
| 2000.0 | Voyage of Discovery | D.F. Warkentin | 121,575 | $29.95 | 62,975 | $19.95 |
| 2001.0 | 50th Anniversary of the National Ballet of Canada | Dora de Pédery-Hunt | 89,390 | $30.95 | 53,668 | $20.95 |
| 2002.0 | Golden Jubilee of Elizabeth II | Royal Canadian Mint Staff | 29,688 | $33.95 | 64,410 | $24.95 |
| 2002.0 | The Queen Mother | Royal Canadian Mint Staff | 9,994 | $49.95 | No BU exists | N/A |
| 2004.0 | The Poppy | Cosme Saffioti | 24,527 | $49.95 | No BU Exists | N/A |
| 2005.0 | 40th Anniversary, Flag of Canada | William Woodruff | N/A | $34.95 | N/A | $24.95 |
| 2006.0 | Victoria Cross | Royal Canadian Mint Staff | N/A | $34.95 | N/A | $26.95 |
| 2006.0 | Medal of Bravery | Royal Canadian Mint Staff | N/A | $54.95 | No BU Exists | N/A |
| 2007.0 | Thayendanegea Joseph Brant | RCM Staff based on image by Laurie McGaw | 65,000 | 42.95 | 35,000 | 34.95 |
| 2007.0 | Celebration of the Arts | Friedrich Peter | 20,000 | $54.95 | No BU Exists | N/A |
| 2008.0 | 400th Anniversary of Quebec | Suzanne Duranceau | 65,000 | $42.95 | 35,000 | $34.95 |
| 2008.0 | 100th Anniversary of Royal Canadian Mint | Jason Bouwman | 25,000 | $59.95 | No BU Exists | N/A |
| 2008.0 | The Poppy (with ultra high relief) | Cosme Saffioti | 5,000 | $139.95 | No BU Exists | N/A |
Question:
What is the mintage (bu) with the artist Royal Canadian Mint Staff and has an issue price (proof) of $54.95?
Answer:
No BU Exists