48 



Figure 8. Cumulative Probability of 



Achieving a Given Extinction Level 



Using 1975 - 1990 Data 



100% 



80% 



60% 



40% 



20% 



Q(y -U-l.l.l I I I I I 1 1 I I I I IJ .1 1 l.lJ.Li I I J I I i 1 1 l_l 1J.1_L 



1 30 



Extinction Level 



i i I I I 1 I I I I I I Ul J 



300 1000 5000 



Figure 9. Cumulative Probability of 



Achieving a Given Extinction Level 



Using 1980 - 1994 Data 



100% 



80% 



p 



r 

 o 



b 

 a 

 b 

 i 



I 40% 



60% 



20% 



Q(y^ I I I I I I I I I r r I r I I I I I I I I I I I I I I I I I I I I 1 I I I I I I t-TT 11 



1 30 300 1000 5000 



Extinction Level 



