Margin loan balances have increased for the past two quarters, representing the first sustained period of growth in the market since it peaked in 2007.According to Reserve Bank data released yesterday, total margin loan balances rose from A$11.5 billion in the December quarter to $11.6 billion in the March quarter.Margins calls fell from 0.75 calls per day per 1000 clients in the December quarter to 0.44 calls in the March quarter. This is the lowest level of calls recorded since 2009.While loan balances suggest the market is recovering, client numbers continue to fall. The number of clients fell from 155,000 in December to 153,000 in March. This is the smallest number of clients recorded since 2006 and is 41 per cent down on the peak number of 260,000 in 2009.