Year	Index
1980	7.905
1981	8.945
1982	10.107
1983	10.81
1984	11.99
1985	13.118
1986	14.837
1987	16.542
1988	19.323
1989	22.209
1990	24.142
1991	27.763
1992	30.761
1993	33.591
1994	38.057
1995	41.715
1996	46.626
1997	50.386
1998	56.611
1999	61.113
2000	65.347
2001	70.332
2002	76.92
2003	84.671
2004	90.527
2005	97.342
2006	108.268
2007	116.566
2008	136.758
2009	146.484
2010	147.876
2011	158.875
2012	168.258
2013	177.325
2014	186.492
2015	185.45
2016	186.383
2017	187.273
2018	189.131
2019	192.261
2020	197.295
2021	209.46
2022	217.449
2023	226.672
2024	236.639