Year	Index (Units)
1992	11.290
1993	11.539
1994	13.026
1995	14.548
1996	16.086
1997	16.753
1998	18.307
1999	19.845
2000	23.790
2001	27.377
2002	31.798
2003	38.753
2004	48.364
2005	52.051
2006	57.981
2007	62.207
2008	69.850
2009	87.504
2010	96.764
2011	100.000
2012	107.173
2013	103.928
2014	105.574
2015	102.815
2016	103.205
2017	98.658
2018	91.945
2019	87.498