Canada
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Hierarchies 2000 2005 2009 2010 2011
  Total 275 241 240 249 249
      Coastal 188 164 168 170 168
          Atlantic 122 118 125 134 128
          Gulf of Mexico NA NA NA NA NA
          Pacific 66 46 43 36 40
          Caribbean NA NA NA NA NA
      Great Lakes 50 43 37 39 37
      Inland 37 34 35 40 44
NA = Not applicable
  Mexico
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Hierarchies 2000 2005 2009 2010 2011 2012 2013 2014 2015
  Total 108 113 116 116 117 117 117 117 117
      Coastal 108 113 116 116 117 117 117 117 117
          Atlantic NA NA NA NA NA NA NA NA NA
          Gulf of Mexico 39 45 45 45 45 45 45 45 45
          Pacific 54 54 57 57 58 58 58 58 58
          Caribbean 15 14 14 14 14 14 14 14 14
      Great Lakes NA NA NA NA NA NA NA NA NA
      Inland NA NA NA NA NA NA NA NA NA
NA = Not applicable
  United States
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Hierarchies 2000 2005 2009 2010 2011 2012 2013 2014
  Total 300 298 293 284 284 281 288 281
  Coastal 187 183 183 177 175 176 178 173
       Atlantic 59 61 63 55 55 54 56 52
       Gulf of Mexico 35 33 35 34 31 35 34 32
       Pacific 86 81 77 80 81 79 80 81
       Caribbean 8 8 8 8 8 8 8 8
  Great Lakes 80 76 76 70 71 70 70 69
  Inland 32 39 34 37 38 35 40 39
.. = Data not available