Year	gross (GPI)
2000	1.07114005088806
2007	1.00601005554199
2008	0.995670020580292
2009	0.98989999294281
2010	0.995220005512238
2011	1.00771999359131
2013	1.02907001972198
2014	1.04033994674683
2015	1.03798997402191
2018	1.02283000946045
2019	1.03489995002747
2020	1.03190994262695
2021	1.02129995822906