Year

Freight volume (million tons)

Length (million km)

Freight volume/length (ton/km)

1975

1176.33

0.7836

1501.19

1980

1421.95

0.8883

1600.75

1985

5380.62

0.9424

5709.49

1990

7240.40

1.0283

7041.14

1995

9403.87

1.1570

8127.80

2000

10,388.13

1.6798

6184.15

2005

13,417.78

3.3452

4011.05

2010

24,480.52

4.0082

6107.61

2015

31,500.19

4.5773

6881.83