Year	gross (GPI)
1982	0.981750011444092
1983	0.970229983329773
1984	0.933860003948212
1985	0.940180003643036
1986	0.948800027370453
1987	0.980809986591339
1988	1.01576995849609
1989	1.01788997650146
1990	1.02305996417999
1991	1.02778005599976
1992	1.01760995388031