Year	gross (GPI)
1999	1.14028000831604
2000	1.35715997219086
2001	1.34999001026154
2002	1.34929001331329
2003	1.31610000133514
2004	1.33723998069763
2005	1.32267999649048
2006	1.33925998210907
2007	1.29628002643585
2008	1.29918003082275
2009	1.32172000408173
2010	1.30508005619049
2011	1.33152997493744
2012	1.32193994522095
2013	1.53613996505737
2014	1.549919962883
2015	1.55211997032166
2016	1.48740994930267