Year	gross (GPI)
1971	0.45745000243187
1973	0.497599989175797
1981	0.680230021476746
1986	0.731689989566803
1987	0.765739977359772
1999	0.844799995422363
2002	0.82888001203537
2003	0.826889991760254
2004	0.848070025444031
2013	0.975329995155334
2014	0.979789972305298
2017	0.993130028247833
2018	1.02289998531342