Typically about 200 km of track has been added per year in the past 20 years (0.23% per year), and about 250 km per year of track doubling (0.29% per year). This can be compared to a total track length of 86 937 km. The gross freight-km per track-km ratio has increased by more than 50% between 1999 and 2009 through an increased axle load, quicker turn-around times and higher train speed.