Year	Index
1980	0.156
1981	0.197
1982	0.196
1983	0.197
1984	0.228
1985	0.223
1986	0.287
1987	0.415
1988	0.553
1989	0.771
1990	1.097
1991	1.375
1992	1.919
1993	3.365
1994	5.862
1995	8.797
1996	17.526
1997	24.381
1998	28.282
1999	30.518
2000	33.562
2001	33.899
2002	37.945
2003	43.811
2004	48.881
2005	58.288
2006	67.101
2007	76.652
2008	100
2009	107.57
2010	120.993
2011	130.405
2012	148.152
2013	164.035
2014	177.495
2015	184.93
2016	199.819
2017	209.256
2018	221.602
2019	233.647
2020	244.127
2021	252.509
2022	260.282
2023	267.026
2024	274.358