Year	gross (GPI)
1988	0.817589998245239
1989	0.832499980926514
1990	0.790910005569458
1991	0.841080009937286
1992	0.877120018005371
1993	0.865339994430542
1994	0.925679981708527
2012	1.29364001750946
2013	1.29782998561859
2014	1.2974499464035
2015	1.30209004878998
2016	1.30541002750397
2017	1.30654001235962
2018	1.32193994522095
2019	1.33575999736786
2020	1.36945998668671
2021	1.38700997829437