a    Projected estimate (medium fertility variant).
b    2019
c    2020
d    Restaurants and hotels are included in "Other activities".
e    Estimate.
f    2016
g    Data refers to a 5-year period preceding the reference year.
h    Including refugees.
i    Data as at the end of December.
j    2018
k    2009
l    2013
m    2017
n    Data are as at 1 January of reporting year.
o    Government only.
p    S&T budget instead of R&D expenditure.
q    Overestimated or based on overestimated data.
r    Excluding business enterprise.
s    Break in the time series.
t    Arrivals by air.
u    The arrivals data relate only to three border posts (N'Djili airport in Kinshasa, the Luano airport in Lubumbashi, and the land border-crossing of Kasumbalesa in Katanga province).