Year	gross (GPI)
2004	1.08891999721527
2005	1.22987997531891
2006	1.21543002128601
2007	1.2941700220108
2009	1.31477999687195
2010	1.32200002670288
2011	1.32702994346619
2012	1.34172999858856
2013	1.35364997386932
2014	1.36342000961304
2015	1.37646996974945
2016	1.41565001010895
2017	1.33998000621796
2018	1.40358996391296
2019	1.40271997451782
2020	1.41146004199982
2021	1.39614999294281
2022	1.42060995101929