Year	gross (GPI)
1970	0.371670007705688
1974	0.550710022449493
1975	0.584450006484985
1977	0.654020011425018
1978	0.691690027713776
1979	0.723119974136353
1980	0.825850009918213
1981	0.82165002822876
1982	0.867929995059967
1984	0.940609991550446
1985	0.968930006027222
1986	0.976300001144409
1987	0.997759997844696
1988	0.965430021286011
1989	1.08992004394531
1991	1.06891000270844
1995	1.05020999908447
1996	1.0932400226593
1997	1.12075996398926
1998	1.00925004482269
1999	1.10133004188538
2000	1.05201995372772
2001	1.06184005737305
2002	1.04983997344971
2004	1.04771995544434
2005	1.05103003978729
2006	1.05864000320435
2007	1.06298005580902
2008	0.970719993114471
2009	1.02941000461578
2010	1.0717099905014
2011	1.07462000846863
2012	1.10241997241974
2013	1.11777997016907
2014	1.12626004219055
2015	1.13446998596191
2016	1.13385999202728
2017	1.13627994060516
2018	1.13541996479034
2019	1.1255099773407
2020	1.13554000854492
2021	1.15137004852295
2022	1.15418994426727