Year	million ton-km
1994	404.9000040294
1995	471.20000392950004
1996	465.5000053421
1997	514.1999938263
1998	518.0000057295999
1999	675.0999996214
2000	724.4509999999999
2001	713.0589999999999
2003	875.3800000000001
2004	972.4100000000001
2018	962.148147143
2019	796.318658
2021	789.5850841290002