Managed reforestation: growth rates by tree species over time?

This data-file tabulates the growth rates of 2,500 trees, in 12 different geographies, finding that younger trees accumualate biomass faster than older trees. The average tree widens its radius by 2mm per year. But on average, growth rates slow by c25% after 20-years, c40% after 40-years and 50% after 60-years.