Banks continue to enjoy strong deposit flows, which have run ahead of credit demand over the past year. But, in the past few months, there has been a marked slowing in flows.Australian Prudential Regulation Authority data released yesterday shows business deposits growing by 13 per cent over the 12 months to May, and retail deposits growing by 8.5 per cent over the same period.A worrying sign for deposit-takers is that the pace of retail deposit flows has slowed in recent months. Over the three months to May, retail deposits grew by 1.4 per cent - an annualised rate of 5.6 per cent.The figures for May show a monthly outflow of 0.1 per cent.National Australia Bank is the market leader in business deposits, with a 23.7 per cent share. NAB had strong growth over the past year, but has fallen below system in the past three months.The number two in the market, Westpac, has lost share, and so has the number three, Commonwealth. ANZ is enjoying strong business deposit growth and if the current trends continue it will overtake Commonwealth.In the household deposit market, RaboDirect has been shooting the lights out. Its deposit book has grown 89 per cent over the past year and 18.6 per cent over the past three months.Other deposit-takers with strong flows over the past year include Bank of Queensland, HSBC, Macquarie and ME Bank.