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IBA on basis of ≥ 10 pairs; 'super sites'   with ≥ 1% of population  Year of   % of sum of   Most   most   most recent   recent   recent      estimates  estimate  estimate     0,00  2012  0  0,00  2019  0  0,00  2019  0  0,66  2021  1230  0,00  2020  0  2,28  2022  4253  0,10  2021  193  0,10  2021  179  0,00  2018  6  2,14  2022  3998  0,01  2022  18  0,22  2021  413  0,00  2021  9  0,00  2019  0  0,00  2012  0  0,19  2021  354  0,27  2016  500  0,22  2020  413  0,00  2019  0  0,00  2017  0


















                     2010s/20s  99,56    2020           1658  0  6391  55  136     949                 906     413           0  1671     31389






                     2000s  0,03  This study  2018-2022     0  130  2089  0  7876  193  206  6  6539  18  766  15  0     906     413  0        1  2069  1  31389  0  0     0





                     1990s  0,01         2013-2017     91  80  4509  0  6376  136  142  228  1255  133  1401  28  0     956  500  0  37  0  0  1815  3  37076  0




                     1980s  0,36 Maxima observed in periods (pairs)  Crawford   et al. 2016   *corrected  2010-2014     81  169  1914  0  7329  136  1582  1177  5647  300  2166  16  0     400     150     0  1     1279  52  30524  0        300




                     1970s  0,04         2004/05           780  0  9038  1062  2142  2903  208     166                                      33024



                                Crawford et al. 2007        1992/93  1978/79                    1199  8708  0  0  8114  24777  42  55  617  141  6271  7890  36486  13767        4  0                                                                          18419  35580








                                         1956/57    14547  0  27757  8300  11760  0                   3186

                     Decade of site's most recent estimate % sum of most recent estimates from different decades  Site  Steenbras Bay Rock  Klein Paternoster Rocks  Columbine Rocks  Malgas Island  Marcus Island  Jutten Island  Meeuw Island  Schaapen Island  Vondeling Island  Dassen Island  Koeberg NPS  Robben Island  Cape Town waterfront  Duikerklip  Die Josie, Flora Bay  Cape Point  Batsata Cove  Smitswinkel Bay cliffs  Simon's Town yachts  Strandfontein  Seal Island, False Bay  Cape Hangklip  Stony Point  Preekst





















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