Year	Index
1987	2.006
1988	3.516
1989	4.184
1990	10.285
1991	21.322
1992	37.398
1993	77.563
1994	76.424
1995	85.598
1996	88.194
1997	93.49
1998	103.173
1999	104.475
2000	100.382
2001	102.647
2002	103.379
2003	105.237
2004	110.313
2005	117.017
2006	122.436
2007	130.416
2008	146.397
2009	150.063
2010	154.746
2011	159.952
2012	162.256
2013	163.524
2014	167.828
2015	170.714
2016	176.762
2017	182.81
2018	188.072
2019	193.444
2020	199.055
2021	204.841
2022	210.8
2023	216.933
2024	223.443