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.
Russia
In 2006, in a bid to compensate for the country's demographic decline, the Russian government started simplifying immigration laws and launched a state program "for providing assistance to voluntary immigration of ethnic Russians from former Soviet republics". In 2009 Russia experienced its highest birth rate since the dissolution of the Soviet Union. In 2012, the birth rate increased again. Russia recorded 1,896,263 births, the highest number since 1990, and even exceeding annual births during the period 1967–1969, with a TFR of about 1.7, the highest since 1991. (Source: Vital statistics table below)