Year	gross (GPI)
1971	1.56862998008728
1972	1.47628998756409
1974	1.62911999225616
1975	1.3062299489975
2001	1.35935997962952
2002	1.3788800239563
2003	1.34297001361847
2004	1.31886005401611
2005	1.34961998462677
2006	1.38517999649048
2007	1.37726998329163
2008	1.37098002433777
2009	1.39239001274109
2010	1.36721003055573
2011	1.39601004123688
2012	1.39680004119873
2013	1.39453995227814
2014	1.40070998668671
2015	1.3855299949646
2016	1.39152002334595
2017	1.39391005039215
2018	1.40299999713898
2019	1.41813004016876
2020	1.42587995529175
2021	1.41294002532959
2022	1.45058000087738