2009 - 275,000 km
2015 - 221,000 km
2014 - 195,000 km
2013 - 100,000 km
2012 - 278,000 km
2014 - 285,000 km
2011 - 25,000 km
2010 - 140,000 km
2014 - 325,000 km
2009 - 182,000 km
2013 - 90,000 km
2013 - 90,000 km