Table 5. Result of the principal factor analysis for upper-middle-income economies.

		Factor loadings‡
Variables†		1	2
Gross domestic product		0.989	−0.012
Industry, value added		0.982	−0.091
Services, etc., value added		0.980	−0.005
Population, total		0.942	0.137
Agriculture, value added		0.920	0.037
Exports of goods and services		0.883	−0.388
Imports of goods and services		0.875	−0.377
Airports		0.865	0.358
GEF benefits index for biodiversity		0.827	0.489
International tourism, expenditures		0.781	−0.382
Nitrous oxide emissions of CO2		0.760	0.525
Species, total known		0.720	0.596
International tourism, receipts		0.641	−0.589
Plant species (higher); total known		0.633	0.637
Rotated sums of squared loadings§	Eigenvalues	10.131	2.218
	% of variance	72.366	15.845
	Cumulative %	72.366	88.212

^†Refer to Table S2 for details and units.

^‡Extraction method was Principal component analysis.

^§Rotation method was Quartimax with Kaizer Normalization.