Year	million ton-km
1970	37
1971	48.5
1972	55.2999992371
1973	90.5
1974	106.4000015259
1975	67.5
1976	68
1977	85.5999984741
1978	105.6999969482
1979	116.8000030518
1980	105.8000030518
1981	100.8000030518
1982	98
1983	96.6999969482
1984	116.8000030518
1985	133.8000030518
1986	123.0999984741
1987	124.5999984741
1988	141.3999938965
1989	160.3000030518
1990	167
1991	163.1000061035
1992	166.8999938965
1993	171.3000030518
1994	181.3000030518
1995	194
1996	210.8999938965
1997	248.5
1998	247.5
1999	225.1000061035
2000	225.475
2001	209.427
2002	194.947
2003	205.674
2004	236.612
2005	235.244
2006	294.083
2007	323.297
2008	347.473
2009	313.533
2010	364.692462967644
2011	355.849353
2012	320.824462
2013	319.454636
2014	348.67247
2015	343.964162
2016	327.012274
2017	421.8294532
2018	454.209368
2019	536.98922
2020	280.010031636
2021	500.44279