Venture capital investment in Maine appears to have declined considerably since 2015.

According to a report issued Wednesday by PricewaterhouseCoopers and CB Insights, there was only one venture capital deal completed in Maine during the first six months of the year, involving seed funding for Portland-based NBT Solutions. The amount invested is unknown, the report said.

In 2016, there were three deals completed with a total amount invested of about $6.4 million.

The new report did not provide information about the nature of each deal, but said there was one for $3.1 million, one for $3 million and another for $250,000.

That was a significant drop-off from 2015, when five venture capital deals were completed totaling $72.8 million, the report said.

The PwC/CB Insights MoneyTree Report includes historical data on venture capital investment in Maine going back to 1995.

It shows that the annual number and total monetary value of venture capital deals in Maine have varied considerably over the years.

Maine’s best year for venture capital was 2000, during which 17 deals were made totaling $172.7 million.

The state’s worst year was 2008, in which no deals occurred.

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