Year	Index (Units)
1992	19.612
1993	21.695
1994	23.276
1995	26.140
1996	27.057
1997	29.150
1998	31.780
1999	35.156
2000	44.591
2001	48.046
2002	59.489
2003	71.891
2004	84.388
2005	100.000
2006	108.752
2007	124.941
2008	170.558
2009	202.904
2010	212.428
2011	228.803
2012	243.920
2013	268.152
2014	271.750
2015	409.880
2016	319.540
2017	261.500
2018	184.940
2019	195.297