Year	million ton-km
1970	62.7000007629
1971	64.4000015259
1972	77.9000015259
1973	83.3000030518
1974	93.8000030518
1975	87.9000015259
1976	101.4000015259
1977	113.1999969482
1978	124.5
1979	120.1999969482
1980	115.9000015259
1981	120.5
1982	114.5
1983	110.3000030518
1984	115.6999969482
1985	115.6999969482
1986	116.5
1987	108
1988	113.5999984741
1989	121.8000030518
1990	123.9000015259
1991	119.1999969482
1992	114.6999969482
1993	121.0999984741
1994	130.8000030518
1995	133.5
1996	172.1999969482
1997	202.6000061035
1998	201.1000061035
1999	199
2000	198.887
2001	184.191
2002	185.061
2003	170.974
2004	174.539