Year	gross (GPI)
1976	0.832120001316071
1989	0.911759972572327
1990	1.18557000160217
1991	1.18991005420685
1992	1.19375002384186
1993	1.14822995662689
1994	1.14031004905701
1995	1.1472100019455
1996	1.16007995605469
1998	1.24258995056152
1999	1.25294005870819
2000	1.2537100315094
2002	1.26490998268127
2007	1.27389001846313
2008	1.27310001850128
2009	1.27377998828888
2010	1.26011002063751
2011	1.2537100315094
2012	1.25336003303528
2013	1.26154005527496
2014	1.26971995830536
2015	1.2763500213623
2016	1.27482998371124
2017	1.27496004104614
2018	1.27374994754791
2019	1.26526999473572
2020	1.26691997051239
2021	1.27986001968384