Year	Index
1980	0.675
1981	0.711
1982	0.713
1983	0.818
1984	0.951
1985	1.122
1986	1.278
1987	2.699
1988	3.74
1989	10.721
1990	16.788
1991	38.235
1992	43.118
1993	49.447
1994	58.794
1995	65.847
1996	68.224
1997	69.248
1998	70.914
1999	79.359
2000	83.954
2001	84.439
2002	87.492
2003	92.036
2004	97.305
2005	104.875
2006	111.064
2007	125.172
2008	136.463
2009	139.369
2010	148.711
2011	161.153
2012	170.675
2013	170.543
2014	169.956
2015	171.367
2016	181.713
2017	184.091
2018	185.439
2019	188.947
2020	176.7
2021	170.11
2022	169.334
2023	162.136
2024	161.739