Year	gross (GPI)
1973	0.882700026035309
1977	0.491079986095428
1982	0.242329999804497
1985	0.294039994478226
1987	0.281340003013611
1992	0.371740013360977
1993	0.361140012741089
1994	0.363929986953735
1995	0.346399992704391
1996	0.327619999647141
2000	0.352250009775162
2001	0.370440006256104
2002	0.410420000553131
2003	0.454670011997223
2004	0.450819998979568
2005	0.484840005636215
2006	0.874180018901825
2007	0.603959977626801
2008	0.616140007972717
2009	0.613370001316071
2010	0.64767998456955
2011	0.619080007076263
2012	0.643400013446808
2013	0.664349973201752
2014	0.711430013179779
2015	0.730040013790131
2016	0.788489997386932
2017	0.814220011234283
2018	0.81852000951767
2019	0.852739751338959