Year	Index
1980	12.625
1981	14.134
1982	14.963
1983	15.927
1984	16.892
1985	17.831
1986	18.45
1987	19.315
1988	21.022
1989	22.679
1990	24.731
1991	27.854
1992	29.205
1993	32.075
1994	35.689
1995	40.338
1996	44.688
1997	49.964
1998	53.865
1999	56.955
2000	58.998
2001	61.599
2002	63.778
2003	65.757
2004	68.759
2005	75.138
2006	81.091
2007	87.392
2008	97.879
2009	117.025
2010	128.849
2011	146.451
2012	162.568
2013	174.533
2014	189.579
2015	198.159
2016	203.833
2017	212.288
2018	220.62
2019	237.485
2020	254.072
2021	266.775
2022	280.114
2023	294.12
2024	308.826