Year	Index
1980	15.378
1981	17.599
1982	24.712
1983	30.828
1984	38.731
1985	59.172
1986	57.442
1987	58.314
1988	60.633
1989	57.725
1990	61.033
1991	63.344
1992	54.276
1993	53.088
1994	66.03
1995	66.03
1996	72.634
1997	63.593
1998	43.157
1999	59.709
2000	51.368
2001	47.827
2002	46.855
2003	62.343
2004	68.692
2005	87.171
2006	100
2007	103.038
2008	123.48
2009	97.759
2010	122.108
2011	142.921
2012	149.859
2013	148.252
2014	146.363
2015	116.809
2016	109.467
2017	123.338
2018	139.489
2019	135.844
2020	139.069
2021	143.107
2022	148.824
2023	154.636
2024	158.837