Year	Index
1980	20.286
1981	21.271
1982	22.946
1983	23.635
1984	27.213
1985	31.242
1986	33.261
1987	36.208
1988	39.394
1989	42.954
1990	46.81
1991	52.159
1992	59.823
1993	67.114
1994	72.817
1995	79.707
1996	87.247
1997	93.323
1998	101.705
1999	109.915
2000	101.867
2001	92.864
2002	95.406
2003	98.24
2004	101.813
2005	106.183
2006	111.623
2007	117.243
2008	125.401
2009	133.47
2010	142.312
2011	154.78
2012	168.739
2013	184.801
2014	199.688
2015	209.843
2016	215.641
2017	222.207
2018	229.374
2019	237.132
2020	247.129
2021	257.184
2022	267.449
2023	277.996
2024	288.702