That is, the rate of growth, total House (TFR) is a constant equal to 1.62 during 5 years, the first (2553 (2010)-2558 (2015)) is then reduced little by little until 1.30 in 2583 (2040)
Ie, the total fertility rate (TFR) is constant at 1.62 in the first 5 years (AD 2553-2558), after which it gradually decreased to 1.30 in the year 2583.
The growth rate of total species (TFR) is fixed at 1.62 during the first year (year 5 2553-2558) and then gradually decreased until the 1.30 in The 2583 .