In which countries is there a natural increase in population? In which country is there a natural decrease in population? Which country shows no change?

• Finland: $$15 - 7 = 8$$
• France: $$13 - 9 = 4$$
• Japan: $$8 - 9 = -1$$
• Spain: $$9 - 7 = 2$$
• India: $$23 - 6 = 17$$
• Sweden: $$10 - 10 = 0$$
• Greenland: $$26 - 31 = -5$$

The countries with a natural increase in population are those with a positive natural rate of population change.

• Finland (8)

• France (4)

• Spain (2)

• India (17)

  Therefore, the countries with a natural increase in population are:
  $\boxed{\text{Finland, France, Spain, India}}$

The countries with a natural decrease in population are those with a negative natural rate of population change.

• Japan ($-1$)

• Greenland ($-5$)

  Therefore, the countries with a natural decrease in population are:
  $\boxed{\text{Japan, Greenland}}$

The country with no change in population is the one with a natural rate of population change of zero.

• Sweden (0)

  Therefore, the country that shows no change is:
  $\boxed{\text{Sweden}}$