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:
| Outcome | Year | Championship | Surface | Partner | Opponents | Score |
| --- | --- | --- | --- | --- | --- | --- |
| Winner | 1999.0 | French Open | Clay | Venus Williams | Martina Hingis Anna Kournikova | 6–3, 6–7 (2–7) , 8–6 |
| Winner | 1999.0 | US Open | Hard | Venus Williams | Chanda Rubin Sandrine Testud | 4–6, 6–1, 6–4 |
| Winner | 2000.0 | Wimbledon | Grass | Venus Williams | Julie Halard-Decugis Ai Sugiyama | 6–3, 6–2 |
| Winner | 2001.0 | Australian Open | Hard | Venus Williams | Lindsay Davenport Corina Morariu | 6–2, 2–6, 6–4 |
| Winner | 2002.0 | Wimbledon (2) | Grass | Venus Williams | Virginia Ruano Pascual Paola Suárez | 6–2, 7–5 |
| Winner | 2003.0 | Australian Open (2) | Hard | Venus Williams | Virginia Ruano Pascual Paola Suárez | 4–6, 6–4, 6–3 |
| Winner | 2008.0 | Wimbledon (3) | Grass | Venus Williams | Lisa Raymond Samantha Stosur | 6–2, 6–2 |
| Winner | 2009.0 | Australian Open (3) | Hard | Venus Williams | Daniela Hantuchová Ai Sugiyama | 6–3, 6–3 |
| Winner | 2009.0 | Wimbledon (4) | Grass | Venus Williams | Samantha Stosur Rennae Stubbs | 7–6 (7–4) , 6–4 |
| Winner | 2009.0 | US Open (2) | Hard | Venus Williams | Cara Black Liezel Huber | 6–2, 6–2 |
| Winner | 2010.0 | Australian Open (4) | Hard | Venus Williams | Cara Black Liezel Huber | 6–4, 6–3 |
| Winner | 2010.0 | French Open (2) | Clay | Venus Williams | Květa Peschke Katarina Srebotnik | 6–2, 6–3 |
| Winner | 2012.0 | Wimbledon (5) | Grass | Venus Williams | Andrea Hlaváčková Lucie Hradecká | 7–5, 6–4 |
Question:
What is the highest year for the US Open?
Answer:
1999.0