Year	gross (GPI)
1992	1.05131995677948
1993	1.0395599603653
1994	1.07438004016876
1995	1.09848999977112
1996	1.12906002998352
1997	1.16365003585815
1998	1.298259973526
1999	1.30770003795624
2000	1.32848000526428
2001	1.37590003013611
2002	1.4072300195694
2003	1.40968000888824
2004	1.41277003288269
2005	1.40586996078491
2006	1.40732002258301
2007	1.39696002006531
2008	1.4125599861145
2009	1.42156994342804
2010	1.39988005161285
2011	1.36795997619629
2012	1.35248994827271
2013	1.3359899520874
2014	1.33897995948792
2015	1.33664000034332
2016	1.32819998264313
2017	1.3313399553299
2018	1.32591998577118
2019	1.32676994800568
2020	1.33736002445221
2021	1.34328997135162
2022	1.3450700044632