Yearclass,Surv_ratio
1973,2.38
1974,4.78
1975,2.76
1976,1.74
1977,6.52
1978,4.14
1979,2.85
1980,5.78
1981,2.19
1982,0.49
1983,0.96
1984,3.92
1985,2.42
1986,2.00
1987,6.56
1988,3.20
1989,1.74
1990,3.99
1991,4.06
1992,3.04
1993,2.51
1994,3.83
1995,4.98
1996,4.25
1997,4.22
1998,3.66
1999,2.20
2000,2.27
2001,1.68
2002,1.63
2003,1.14
2004,1.44