Year	gross (GPI)
1981	0.852550029754639
1991	0.876850008964539
1995	1.20794999599457
1996	1.0842399597168
1997	1.02186000347137
1999	1.03752994537354
2000	0.91772997379303
2001	0.896210014820099
2002	0.918950021266937
2003	0.879869997501373
2004	0.951170027256012
2005	0.960659980773926
2006	1.05578994750977
2007	1.06038999557495
2008	1.15147995948792
2009	1.18073999881744
2010	1.20387005805969
2011	1.17511999607086
2012	1.22899997234344
2013	1.22838997840881
2014	1.20272994041443
2015	1.18024003505707
2016	1.12468004226685
2017	1.1038099527359
2018	1.07713997364044
2019	1.08809995651245
2020	1.10652995109558
2021	1.11722004413605
2022	1.14094996452332
2023	1.15538942813873