Year	Index
1980	0.053
1981	0.062
1982	0.077
1983	0.118
1984	0.147
1985	0.183
1986	0.233
1987	0.308
1988	0.573
1989	0.883
1990	1.32
1991	1.967
1992	3.152
1993	4.16
1994	5.217
1995	6.405
1996	8.039
1997	10.508
1998	15.068
1999	24.214
2000	46.25
2001	56.62
2002	61.92
2003	65.68
2004	66.96
2005	69.057
2006	71.038
2007	73.396
2008	79.878
2009	83.322
2010	86.095
2011	90.752
2012	94.531
2013	97.084
2014	100.644
2015	104.046
2016	105.211
2017	105.004
2018	105.283
2019	105.848
2020	107.584
2021	109.144
2022	110.45
2023	111.583
2024	112.657