Year	gross (GPI)
1990	0.191269993782043
1998	0.686450004577637
1999	0.630159974098206
2002	0.653519988059998
2011	0.372949987649918
2013	0.804660022258759
2015	0.793229997158051
2016	0.83432000875473
2017	0.817591726779938
2018	0.817952215671539
2019	0.899158954620361