Year	Index
1986	5.103
1987	3.339
1988	12.243
1989	16.487
1990	27.41
1991	45.936
1992	54.023
1993	56.876
1994	65.139
1995	84.592
1996	92.381
1997	92.228
1998	80.381
1999	80.135
2000	79.628
2001	80.364
2002	83.674
2003	86.254
2004	94.726
2005	103.08
2006	109.986
2007	123.878
2008	148.519
2009	158.199
2010	176.784
2011	208.83
2012	223.064
2013	236.529
2014	240.879
2015	242.317
2016	253.796
2017	260.388
2018	268.155
2019	276.736
2020	286.145
2021	296.16
2022	306.822
2023	318.481
2024	331.221