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:
| Tournament | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | W–L |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Australian Open | A | A | A | A | A | A | Q3 | A | Q3 | 4R | 2R | 1R | 1R | 1R | 3–5 |
| French Open | A | A | A | A | A | A | Q1 | A | 1R | 1R | 3R | 3R | 2R |  | 5–5 |
| Wimbledon | A | A | A | A | A | A | Q1 | Q1 | Q1 | 2R | 4R | 2R | QF |  | 9–4 |
| US Open | A | A | A | A | A | 3R | Q3 | A | Q2 | 1R | A | 1R | 1R |  | 2–4 |
| Win–Loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 2–1 | 0–0 | 0–0 | 0–1 | 3–4 | 6–3 | 3–4 | 5–4 | 0–1 | 19–18 |
| Titles–Finals | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–1 | 0–1 | 0–0 | 0–0 | 0–0 |  | 0–2 |
| Year End Ranking | 427 | 440 | 371 | 219 | 142 | 125 | 222 | 209 | 101 | 70 | 57 | 74 | 72 |  |  |
Question:
in what year was the best year end ranking achieved?
Answer:
2011