Year	Index
1987	1.389
1988	1.594
1989	2.804
1990	3.622
1991	3.997
1992	4.237
1993	4.674
1994	4.94
1995	6.361
1996	7.172
1997	7.798
1998	18.862
1999	35.207
2000	38.925
2001	41.854
2002	48.211
2003	54.297
2004	59.001
2005	64.181
2006	67.099
2007	70.949
2008	73.196
2009	76.065
2010	80.458
2011	86.654
2012	90.755
2013	96.789
2014	99.111
2015	100
2016	102.487
2017	102.639
2018	104.158
2019	107.179
2020	110.501
2021	113.927
2022	117.458
2023	121.1
2024	124.854