With reference to the above graph, consider the following statements considering 1970 as base year:

1. Population has stabilized after 35 years.

2. Population growth rate has stabilized after 35 years.

3. Death rate has fallen by 10% in the first 10 years.

4. Birthrate has stabilized after 35 years.

Which of the above are the most logical and rational statements that can be made from the above graph?