Year	Index
1988	0.002
1989	0.068
1990	3.513
1991	16.955
1992	28.562
1993	42
1994	52.715
1995	59.978
1996	65.903
1997	70.741
1998	74.935
1999	77.165
2000	80.068
2001	80.952
2002	81.219
2003	83.626
2004	88.328
2005	90.185
2006	97.663
2007	100
2008	102.09
2009	103.648
2010	109.949
2011	115.592
2012	117.989
2013	119.662
2014	122.81
2015	126.379
2016	130.717
2017	135.682
2018	138.324
2019	141.558
2020	144.619
2021	147.661
2022	150.76
2023	153.892
2024	157.107