Year	Index
1980	0.053
1981	0.064
1982	0.075
1983	0.081
1984	0.095
1985	0.161
1986	0.314
1987	1.846
1988	4.708
1989	8.106
1990	13.692
1991	20.553
1992	41.075
1993	51.236
1994	55.455
1995	61.157
1996	66.587
1997	71.746
1998	75.01
1999	75.191
2000	74.923
2001	74.648
2002	75.961
2003	76.925
2004	78.211
2005	77.095
2006	80.25
2007	83.506
2008	92.439
2009	93.167
2010	96.878
2011	101.694
2012	108.387
2013	113.613
2014	115.657
2015	111.381
2016	110.472
2017	115.417
2018	122.421
2019	124.884
2020	127.799
2021	130.751
2022	133.734
2023	136.739
2024	139.875