year	Passenger kilometre (pkm)	Gross Domestic Product (GDP)	Decoupling	Intensity
2000	1.0	1.0		1.0
2001	1.01	1.02		1.0
2002	1.03	1.03		0.99
2003	1.03	1.05		0.99
2004	1.05	1.08		0.97
2005	1.05	1.1		0.95
2006	1.06	1.14		0.93
2007	1.07	1.18		0.91
2008	1.08	1.18		0.91
2009	1.09	1.13		0.96
2010	1.08	1.16		0.93
2011	1.08	1.18		0.91
2012	1.07	1.18		0.9
2013	1.08	1.19		0.9
2014	1.09	1.21		0.9
2015	1.12	1.24		0.9
2016	1.14	1.27		0.9