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Basis of preparation and accounting policies (Details)
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Basis of preparation and accounting policies                                                                                                
Closing rate 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.3 7.09 7.09 7.09 7.09 7.09 7.09 7.09 7.09 7.09 7.09                     7.77 85.61 16,095 4.47 1.36 32.78 34.24 0.8 25,485 7.81 83.21 15,397 4.6 1.32 30.69 34.37 0.78 24,262
Average rate 7.2 7.8 83.67 15,844.88 4.58 1.34 32.12 35.29 0.78 25,057.63 7.09 7.83 82.6 15,230.82 4.56 1.34 31.17 34.8 0.8 23,835.92 6.73 7.83 78.63 14,852.24 4.4 1.38 29.81 35.06 0.81 23,409.87