Year,SSB_mt,R_knum
1980,,
1981,,
1982,22582,74300
1983,24435,80300
1984,21870,48000
1985,19853,49000
1986,18391,53000
1987,19082,44000
1988,10883,13000
1989,7025,27000
1990,9940,30000
1991,8743,29000
1992,9905,32000
1993,12287,33000
1994,15100,35000
1995,18976,39000
1996,20067,28000
1997,20413,29000
1998,22245,31000
1999,22551,29000
2000,26130,39000
2001,33835,31000
2002,39051,36000
2003,44786,25000
2004,43951,36000
2005,47498,15000