Year	Index
1981	5.005
1982	5.248
1983	5.838
1984	6.155
1985	7.227
1986	6.407
1987	6.142
1988	6.671
1989	7.396
1990	9.328
1991	10.611
1992	12.222
1993	15.606
1994	22.156
1995	26.189
1996	30.645
1997	35.839
1998	38.803
1999	42.652
2000	49.185
2001	54.84
2002	61.077
2003	84.152
2004	102.4
2005	117.658
2006	132.167
2007	142.599
2008	170.9
2009	162.9
2010	170.5
2011	188.2
2012	200.5
2013	209.6
2014	220.8
2015	245.7
2016	276.4
2017	318.9
2018	365.5
2019	414.843
2020	466.739
2021	522.748
2022	580.25
2023	641.177
2024	705.294