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2010/20s  72.92  2010s  0  0  0  33  0  0  0  31  44  0  1  0  0  2  0  0  0  0  86  9  0  105  0  32  0  41



                               Maximum observed pairs in different decades

                       2000s  11.89   2000s  0  1  9  37  0  2        23     12                    59        108  0





                       1990s  1.51   1990s  9  0  29  3  0        23  93     1                 111        83  58
                    % of sum of most recent estimates from different decades



                       1980s  13.62  1980s  3    35      19  101  23  71    9       18   37  28      10  56  12





                       1970s  0.05   1970s  0    50         100  23     19     46  23        35     8  22  39  51  20




                           % of sum   of most   recent   estimates  0.00  0.00  0.00  0.76  0.00  0.00  0.00  1.20  0.97  0.00  0.00  0.00  0.00  0.00  0.00  0.00  0.00  0.00  3.03  0.00  0.00  4.92  0.00  0.38  0.00  2.22






                    2010s  Year of   most   recent   estimate  2018  2018  2018  2018  2018  2018  2012  2020  2017  2018  2017  2017  2017  2018  2018  2018  2018  2018  2018  2018  2018  2018  2018  2018  2018  2018




                    2020s  Most   recent   estimate   (pairs)  0  0  0  14  0  0  0  22  18  0  0  0  0  0  0  0  0  0  56  0  0  91  0  7  0  41



                    2000s  This   study  2018-  2022  0  0  0  32  0  0       22     0           0  0  0  0  0  56  0  0  91  0  29  0  41




                    1990s  Crawford   et al.   2013  2008-  2012  0  1  0  33  0  0  0  23  17  0  1  0  0  0  0  0  0  0  62  9  0  105  0  32  0



                    1980s Maximum observed pairs in different periods  Kemper   et al.   2007  1995-  2006  0  9  30  32  72  0




                    1970s  Brooke et    al. 1982  1977-1981  33  19  70  18  19  9  4  18  37     7  39  51  20  12



                    Decade of most recent estimate  Vondeling Island  Caspian Island  Meeurots, Yzerfontein  Dassen Island  Koeberg Nuclear Power Station  Robben Island  Die Josie, Flora Bay  Cape Point  Steenbras Rock, Partridge   Strandfontein Sewerage Works  Seal Island, False Bay  Wolfgat Nature Reserve  Paardevlei  Cape Hangklip rocks  Ospunt rock  Maasbaai rock  Holbaaipunt rock  Grootvleie island  Stony Point, Betty's Bay  Preekstoel  Seal Rock, Franskraal  Dyer Island  Geyser Island  Quoin Rock 2 km w Aasfo










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