Year	Index
1980	0.13
1981	0.145
1982	0.145
1983	0.156
1984	0.161
1985	0.161
1986	0.183
1987	0.229
1988	0.33
1989	0.472
1990	0.671
1991	0.983
1992	1.314
1993	1.649
1994	2.493
1995	3.411
1996	4.845
1997	8.19
1998	11.638
1999	12.92
2000	14.341
2001	15.663
2002	17.25
2003	18.939
2004	21.456
2005	25.136
2006	30.936
2007	36.674
2008	48.409
2009	56.617
2010	64.17
2011	73.361
2012	81.165
2013	87.745
2014	93.883
2015	98.81
2016	104.179
2017	110.11
2018	118.769
2019	128.053
2020	135.077
2021	141.139
2022	146.065
2023	150.447
2024	154.96