Birth rate
As of 2017, Niger has the highest birth rate in the world with 49.443 per thousand people. 
Japan has one of the lowest birth rates in the world with 8 per thousand people.
While in Japan there are 126 million people and in Niger 21 million, both countries had around 1 million babies born in 2016.
Rivne Oblast
Rivne is one of the regions with the highest birth rate in all of Ukraine. The heavy rural (about two thirds of the population is rural) and ethnic Ukrainian (close to 95%) composition of the population might be responsible for this. However the birth rate is not uniform across Rivne, with raions like Ostroh having extremely low birth rates (9.7 per 1000) and other raions like Rokytnivskyi having extremely high birth rates (24.0 per 1000).