Over the comparable periods, average daily turnover on the ASX has gone from A$1 billion ($1.27 billion) to A$5 billion.
Doyle said a steady flow of new issues was important for the maintenance of a vibrant capital market.
"It's not to keep investment bankers happy, it's to keep up with the normal rate of attrition that you get with companies either being taken over [or] hitting the skids," Doyle said.
"In any market, not just New Zealand's, you need a flow of new companies to keep it fresh."
JBWere is 80.1 per cent owned by the Bank of New Zealand's owner National Australia Bank and 19.9 per cent by Goldman Sachs.
Fund managers expect to see strong interest in the mixed ownership companies - power generators Mighty River Power, Meridian and Genesis Energy and coal company Solid Energy.
The Government also intends to sell down its three-quarter stake in NZX-listed Air New Zealand.
"Our analysis suggests pent-up demand for quality equity offerings amongst local investors - with up to $5 billion of potential demand simply from a re-weighting of household assets back to mid-1990s levels of domestic equity ownership," Doyle said in a research note.
Public asset sell-downs generally had had a good track record for investors, he said.
Privatised companies such as Contact, Telecom, Auckland International Airport have gone on to become the backbone of the New Zealand sharemarket.
In 2010, JBWere said its concern was that the New Zealand equity market had become a poor vehicle for facilitating savings behaviour, and that the lack of initial public offers (IPOs), waning international investor interest and poor market liquidity were indicative of a market in structural decline.
Doyle said that if households expanded their proportion of equity ownership back to mid-90s levels, it would create $5 billion of new demand for equities.
"Without a partial sell-down of state-owned enterprises, the New Zealand equity market would probably continue to struggle for relevance and critical mass," he said.
"We view the introduction of the mixed ownership model as a significant step forward for NZ Inc."
The Treasury has estimated that extending the mixed ownership model to five companies would raise $5 billion to $7 billion.
First New Zealand Capital working with Credit Suisse Australia, Macquarie Capital New Zealand and Goldman Sachs New Zealand are the joint lead managers for this year's Mighty River Power sale, which is expected to happen in September.