.6 % 80 .5 % 84 .9 % 85 .4 % 87 .9 % 90 .8 % 86 % 85 .8 % 84 % 78 .3 % 20 10 20 11 20 12 20 13 20 14 20 15 20 16 20 17 20 18 20 19 rainfall, with any significant rainfall being received during periods where water demand is much lower (for example, during the winter months), has meant Port Waratah had to purchase greater volumes of potable water to maintain our dust management commitments.