Conn. Lawyer, perhaps your second source is questionable. This link is to the New York Department of taxation and finance’s stock transfer tax page for the current year.

Sweden did experience the drop when the tax was established. On the other hand, Hong Kong did not see a decline when it increased its stamp duty on stock transfers and bearable instruments. Neither Brazil nor Peru experienced a decline when their financial transfer taxes were implemented.

Since the decline is not universal I submit there were other elements that caused the flight.