Year	Index
1980	5.935
1981	5.809
1982	5.814
1983	5.809
1984	5.623
1985	5.83
1986	5.694
1987	5.695
1988	5.693
1989	5.695
1990	5.695
1991	7.717
1992	26.987
1993	57.977
1994	79.443
1995	87.259
1996	100
1997	111.245
1998	118.733
1999	121.229
2000	128.076
2001	132.957
2002	137.806
2003	144.97
2004	149.54
2005	154.485
2006	158.314
2007	165.258
2008	172.062
2009	176.223
2010	184.141
2011	188.404
2012	190.368
2013	191.179
2014	193.414
2015	194.5
2016	193.738
2017	196.421
2018	200.502
2019	204.951
2020	210.075
2021	216.149
2022	222.988
2023	229.982
2024	237.16