Year	gross (GPI)
1974	0.82846999168396
1975	0.782239973545074
1977	0.905569970607758
1979	1.07412004470825
1980	1.12035000324249
1982	1.01851999759674
1983	0.99752002954483
1998	1.450080037117
1999	1.42439997196198
2000	1.42146003246307
2001	1.43983995914459
2002	1.47899997234344
2003	1.50216996669769
2004	1.49931001663208
2005	1.42136001586914
2006	1.39959001541138
2021	1.44198000431061