
Data presence by year for each fleet and data type.
file: data_plot.png

Data presence by year for each fleet, where circle area is 
  relative within a data type. Circles are proportional to 
  total catch for catches; to precision for indices, discards, and 
  mean body weight observations; and to total sample size for 
 compositions and mean weight- or length-at-age observations. 
 Observations excluded from the likelihood have 
 equal size for all years. 
 Note that since the circles are are scaled relative 
  to maximum within each type, the scaling within separate plots 
  should not be compared.
file: data_plot2.png