Year	Index
1981	0.116
1982	0.127
1983	0.132
1984	0.165
1985	0.264
1986	0.652
1987	5.487
1988	7.397
1989	9.643
1990	17.075
1991	22.914
1992	48.13
1993	50.347
1994	56.293
1995	62.474
1996	66.626
1997	71.109
1998	75.261
1999	73.232
2000	72.053
2001	72.006
2002	74.695
2003	76.347
2004	77.857
2005	76.61
2006	82.137
2007	87.034
2008	92.496
2009	95.631
2010	100
2011	103.119
2012	113.514
2013	114.785
2014	113.974
2015	110.097
2016	113.556
2017	119.246
2018	123.991
2019	126.773
2020	129.754
2021	132.759
2022	135.787
2023	138.829
2024	142.018