Year,SSB_kmt,R_mnum
1976,,
1977,,27.713
1978,80.639,23.513
1979,89.511,20.104
1980,92.771,41.392
1981,86.62,17.471
1982,89.853,9.615
1983,78.427,27.391
1984,67.336,8.669
1985,55.513,42.747
1986,57.431,16.376
1987,68.324,23.446
1988,73.702,15.673
1989,72.052,9.184
1990,68.245,17.849
1991,52.49,6.641
1992,39.231,8.183
1993,29.29,5.252
1994,19.002,3.248
1995,17.34,5.928
1996,18.388,10.096
1997,18.521,4.577
1998,19.078,12.809
1999,21.003,7.928
2000,23.697,3.436
2001,30.031,3.352
2002,27.474,2.283
2003,22.987,21.22
2004,22.563,10.398