a    2017
b    2019
c    2018
d    Excludes hotels and restaurants.
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    2009
k    2013
l    Data are as at 1 January of reporting year.
m    Government only.
n    S&T budget instead of R&D expenditure.
o    Excluding business enterprise.
p    Overestimated or based on overestimated data.
q    Break in the time series.
r    Arrivals by air.