Year	Index
1980	31.78
1981	29.721
1982	31.323
1983	29.54
1984	21.318
1985	20.601
1986	20.703
1987	20.536
1988	23.529
1989	26.635
1990	38.644
1991	41.512
1992	42.933
1993	46.622
1994	51.194
1995	56.788
1996	60.522
1997	62.572
1998	65.218
1999	65.867
2000	68.024
2001	70.279
2002	71.335
2003	73.453
2004	75.448
2005	78.356
2006	81.746
2007	85.328
2008	88.34
2009	88.287
2010	90.624
2011	95.984
2012	98.43
2013	98.998
2014	100
2015	101.312
2016	101.849
2017	102.744
2018	104.742
2019	105.844
2020	108.112
2021	110.259
2022	112.518
2023	114.638
2024	116.749