Year	gross (GPI)
1971	0.640190005302429
1972	0.656719982624054
1982	0.826059997081757
1983	0.787509977817535
1998	0.819149971008301
2008	0.833090007305145
2009	0.823400020599365
2010	0.777629971504211
2011	0.630320012569427