Year	gross (GPI)
1978	0.311899989843369
1979	0.401939988136292
1980	0.2917799949646
1983	0.214230000972748
1999	0.592260003089905
2005	0.661450028419495
2006	0.618059992790222
2007	0.581900000572205
2008	0.610480010509491
2009	0.648190021514893
2010	0.655330538749695
2011	0.755979776382446
2012	0.769086182117462
2013	0.826659977436066
2017	1.00189352035522
2018	1.02020740509033
2019	1.02627825737
2020	1.05748653411865
2021	1.15630841255188
2022	1.03093242645264