Year	gross (GPI)
2006	1.04493999481201
2007	1.01916003227234
2008	0.981429994106293
2009	0.986810028553009
2010	0.989369988441467
2011	1.0160299539566
2012	1.04551994800568
2013	1.10141003131866
2014	1.12430000305176
2015	1.13967001438141
2016	1.15074002742767
2017	1.12962996959686
2018	1.1274299621582
2019	1.1380900144577
2020	1.11873996257782
2021	1.13912999629974
2022	1.14539003372192