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 | Tournament | Venue | Result | Event |
| --- | --- | --- | --- | --- |
| 2001.0 | World Youth Championships | Debrecen , Hungary | 7th | 10,000 m |
| 2002.0 | World Junior Championships | Kingston, Jamaica | 19th | 10,000 m |
| 2004.0 | World Race Walking Cup | Naumburg , Germany | 75th | 20km |
| 2005.0 | World Championships | Helsinki , Finland | 18th | 20 km |
| 2006.0 | Commonwealth Games | Melbourne , Australia | 3rd | 20km |
| 2006.0 | World Race Walking Cup | La Coruña , Spain | 14th | 20km |
| 2007.0 | World Championships | Osaka, Japan | DSQ | 20 km |
| 2008.0 | World Race Walking Cup | Cheboksary , Russia | 10th | 20km |
| 2008.0 | Olympic Games | Beijing, PR China | 3rd | 20km |
| 2008.0 | Olympic Games | Beijing, PR China | 2nd | 50km |
| 2009.0 | World Championships | Berlin , Germany | 6th | 20 km |
| 2009.0 | World Championships | Berlin , Germany | 7th | 50 km |
| 2010.0 | World Race Walking Cup | Chihuahua , Mexico | 3rd | 50km |
| 2010.0 | Commonwealth Games | Delhi , India | 1st | 20km |
| 2011.0 | World Championships | Daegu , South Korea | 3rd | 50 km |
| 2012.0 | World Race Walking Cup | Saransk , Russia | 3rd | 50km |
| 2012.0 | Olympic Games | London , United Kingdom | 7th | 20km |
| 2012.0 | Olympic Games | London , United Kingdom | 2nd | 50km |
| 2013.0 | World Championships | Moscow , Russia | 3rd | 50km |
Question:
What is earliest year that had a 50km event with a 2nd place result played in London, United Kingdom?
Answer:
2012.0