Year	gross (GPI)
1991	1.17186999320984
1996	1.1512199640274
1997	1.20738995075226
1998	1.20556998252869
1999	1.22497999668121
2000	1.23499000072479
2001	1.23684000968933
2002	1.25573003292084
2003	1.26531004905701
2004	1.2671799659729
2005	1.26111996173859
2006	1.26630997657776
2007	1.2876900434494
2008	1.31284999847412
2009	1.31076002120972
2010	1.29530000686646
2011	1.28131997585297
2012	1.26761996746063
2013	1.24205005168915
2014	1.23312997817993
2015	1.23211002349854
2016	1.21498000621796
2017	1.18663001060486
2018	1.14785003662109
2019	1.1104199886322
2020	1.10801005363464
2021	1.11246001720428
2022	1.11029994487762